mirror of
https://github.com/warmcat/libwebsockets.git
synced 2025-03-09 00:00:04 +01:00
minimal: smp + foreign: libuv foreign loops
AG: various fixes and adaptation of test protocol to use ring lock to protect global wsi list against modifications from other threads while in use
This commit is contained in:
Mykola Stryebkov
Andy Green
parent
4f0545cc54
commit
dbc3acd5eb
9 changed files with 792 additions and 0 deletions
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project(lws-minimal-ws-server-threads-foreign-smp C)
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cmake_minimum_required(VERSION 2.8)
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find_package(libwebsockets CONFIG REQUIRED)
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list(APPEND CMAKE_MODULE_PATH ${LWS_CMAKE_DIR})
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include(CheckIncludeFile)
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include(CheckCSourceCompiles)
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include(LwsCheckRequirements)
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set(SAMP lws-minimal-ws-server-threads-foreign-smp)
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set(SRCS minimal-ws-server.c)
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set(requirements 1)
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require_pthreads(requirements)
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require_lws_config(LWS_ROLE_WS 1 requirements)
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require_lws_config(LWS_WITH_SERVER 1 requirements)
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require_lws_config(LWS_WITH_TLS 1 requirements)
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require_lws_config(LWS_WITH_LIBUV 1 requirements)
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CHECK_C_SOURCE_COMPILES("#include <libwebsockets.h>\nint main(void) {\n#if defined(LWS_WITH_LIBUV)\n return 0;\n#else\n fail;\n#endif\n return 0;\n}\n" LWS_WITH_LIBUV)
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if (NOT LWS_WITH_LIBUV)
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set(requirements 0)
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endif()
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if (requirements)
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add_executable(${SAMP} ${SRCS})
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find_path(LIBUV_INCLUDE_DIRS NAMES uv.h)
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find_library(LIBUV_LIBRARIES NAMES uv)
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message("libuv include dir: ${LIBUV_INCLUDE_DIRS}")
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message("libuv libraries: ${LIBUV_LIBRARIES}")
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include_directories("${LIBUV_INCLUDE_DIRS}")
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set(extralibs ${extralibs} ${LIBUV_LIBRARIES})
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message("Extra libs: ${extralibs}")
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if (websockets_shared)
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target_link_libraries(${SAMP} websockets_shared ${extralibs} ${PTHREAD_LIB} ${LIBWEBSOCKETS_DEP_LIBS})
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add_dependencies(${SAMP} websockets_shared)
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else()
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target_link_libraries(${SAMP} websockets ${extralibs} ${PTHREAD_LIB} ${LIBWEBSOCKETS_DEP_LIBS})
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endif()
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endif()
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@ -0,0 +1,39 @@
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# lws minimal ws server (threads) + SMP
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This demonstrates both independent threads creating content as in the
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-threads example, multiple service threads as in the http-server-smp
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example (but with ws), and using the foreign libuv loop.
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## build
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You must first build libwebsockets itself with cmake `-DLWS_MAX_SMP=8`
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or some other number greater than one, as well as `-DLWS_WITH_LIBUV=1`
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```
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$ cmake . && make
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```
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Pthreads is required on your system.
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## usage
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```
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$ ./lws-minimal-ws-server-threads-smp
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[2019/01/28 06:59:17:4217] USER: LWS minimal ws server + threads + smp | visit http://localhost:7681
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[2019/01/28 06:59:17:4219] NOTICE: Service threads: 2
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[2019/01/28 06:59:17:4220] NOTICE: LWS_CALLBACK_EVENT_WAIT_CANCELLED in svc tid 0x7fec48af8700
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[2019/01/28 06:59:17:4220] NOTICE: LWS_CALLBACK_EVENT_WAIT_CANCELLED in svc tid 0x7fec48af8700
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...
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```
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Visit http://localhost:7681 on multiple browser windows. You may need to open
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4 before the second service thread is used (check "svc tid" in the browser output).
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Two lws service threads are started.
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Two separate asynchronous threads generate strings and add them to a ringbuffer,
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signalling all lws service threads to send new entries to all the browser windows.
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This demonstrates how to safely manage asynchronously generated content
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and hook it up to the lws service threads.
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@ -0,0 +1,182 @@
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/*
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* lws-minimal-ws-server
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*
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* Written in 2010-2020 by Andy Green <andy@warmcat.com>
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*
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* This file is made available under the Creative Commons CC0 1.0
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* Universal Public Domain Dedication.
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*
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* This demonstrates a minimal ws server that can cooperate with
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* other threads cleanly. Two other threads are started, which fill
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* a ringbuffer with strings at 10Hz.
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*
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* The actual work and thread spawning etc are done in the protocol
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* implementation in protocol_lws_minimal.c.
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*
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* To keep it simple, it serves stuff in the subdirectory "./mount-origin" of
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* the directory it was started in.
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* You can change that by changing mount.origin.
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*/
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#include <libwebsockets.h>
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#include <string.h>
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#include <signal.h>
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#if defined(WIN32)
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#define HAVE_STRUCT_TIMESPEC
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#if defined(pid_t)
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#undef pid_t
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#endif
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#endif
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#include <pthread.h>
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#include <uv.h>
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#define COUNT_THREADS 5
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#define LWS_PLUGIN_STATIC
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#include "protocol_lws_minimal.c"
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static struct lws_protocols protocols[] = {
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{ "http", lws_callback_http_dummy, 0, 0 },
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LWS_PLUGIN_PROTOCOL_MINIMAL,
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{ NULL, NULL, 0, 0 } /* terminator */
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};
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static struct lws_context *context;
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static int interrupted;
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static uv_loop_t loop[COUNT_THREADS];
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static const struct lws_http_mount mount = {
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/* .mount_next */ NULL, /* linked-list "next" */
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/* .mountpoint */ "/", /* mountpoint URL */
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/* .origin */ "./mount-origin", /* serve from dir */
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/* .def */ "index.html", /* default filename */
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/* .protocol */ NULL,
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/* .cgienv */ NULL,
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/* .extra_mimetypes */ NULL,
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/* .interpret */ NULL,
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/* .cgi_timeout */ 0,
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/* .cache_max_age */ 0,
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/* .auth_mask */ 0,
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/* .cache_reusable */ 0,
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/* .cache_revalidate */ 0,
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/* .cache_intermediaries */ 0,
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/* .origin_protocol */ LWSMPRO_FILE, /* files in a dir */
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/* .mountpoint_len */ 1, /* char count */
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/* .basic_auth_login_file */ NULL,
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};
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/*
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* This demonstrates how to pass a pointer into a specific protocol handler
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* running on a specific vhost. In this case, it's our default vhost and
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* we pass the pvo named "config" with the value a const char * "myconfig".
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*
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* This is the preferred way to pass configuration into a specific vhost +
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* protocol instance.
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*/
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static const struct lws_protocol_vhost_options pvo_ops = {
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NULL,
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NULL,
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"config", /* pvo name */
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(void *)"myconfig" /* pvo value */
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};
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static const struct lws_protocol_vhost_options pvo = {
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NULL, /* "next" pvo linked-list */
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&pvo_ops, /* "child" pvo linked-list */
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"lws-minimal", /* protocol name we belong to on this vhost */
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"" /* ignored */
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};
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void *thread_service(void *threadid)
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{
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while (lws_service_tsi(context, 0,
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(int)(lws_intptr_t)threadid) >= 0 &&
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!interrupted)
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lwsl_notice("%s\n", __func__);
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pthread_exit(NULL);
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return NULL;
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}
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void signal_cb(uv_signal_t *watcher, int signum)
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{
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int n;
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if (interrupted)
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return;
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lwsl_notice("signal_cb: signal %d caught\n", watcher->signum);
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interrupted = 1;
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uv_signal_stop(watcher);
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lws_context_destroy(context);
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for (n = 0; n < COUNT_THREADS; n++)
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uv_stop(&loop[n]);
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}
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int main(int argc, const char **argv)
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{
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int n, logs = LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE;
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uv_signal_t *s, signal_outer[3 * COUNT_THREADS];
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pthread_t pthread_service[COUNT_THREADS];
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struct lws_context_creation_info info;
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void *foreign_loops[COUNT_THREADS];
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const char *p;
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void *retval;
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if ((p = lws_cmdline_option(argc, argv, "-d")))
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logs = atoi(p);
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lws_set_log_level(logs, NULL);
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lwsl_user("LWS minimal ws server + threads + smp | visit http://localhost:7681\n");
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for (n = 0; n < COUNT_THREADS; n++) {
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int m;
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uv_loop_init(&loop[n]);
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for (m = 0; m < 3; m++) {
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s = &signal_outer[n * 3 + m];
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uv_signal_init(&loop[n], s);
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uv_signal_start(s, signal_cb, SIGINT);
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}
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foreign_loops[n] = &loop[n];
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}
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memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
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info.port = 7681;
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info.mounts = &mount;
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info.pcontext = &context;
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info.protocols = protocols;
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info.pvo = &pvo; /* per-vhost options */
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info.foreign_loops = foreign_loops;
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info.count_threads = COUNT_THREADS;
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info.options = LWS_SERVER_OPTION_LIBUV |
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LWS_SERVER_OPTION_HTTP_HEADERS_SECURITY_BEST_PRACTICES_ENFORCE;
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context = lws_create_context(&info);
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if (!context) {
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lwsl_err("lws init failed\n");
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return 1;
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}
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lwsl_notice(" Service threads: %d\n", lws_get_count_threads(context));
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/* start all the service threads */
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for (n = 0; n < lws_get_count_threads(context); n++)
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if (pthread_create(&pthread_service[n], NULL, thread_service,
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(void *)(lws_intptr_t)n))
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lwsl_err("Failed to start service thread\n");
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/* wait for all the service threads to exit */
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while ((--n) >= 0)
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pthread_join(pthread_service[n], &retval);
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lws_context_destroy(context);
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return 0;
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}
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@ -0,0 +1,68 @@
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var head = 0, tail = 0, ring = new Array();
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function get_appropriate_ws_url(extra_url)
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{
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var pcol;
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var u = document.URL;
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/*
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* We open the websocket encrypted if this page came on an
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* https:// url itself, otherwise unencrypted
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*/
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if (u.substring(0, 5) === "https") {
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pcol = "wss://";
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u = u.substr(8);
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} else {
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pcol = "ws://";
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if (u.substring(0, 4) === "http")
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u = u.substr(7);
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}
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u = u.split("/");
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/* + "/xxx" bit is for IE10 workaround */
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return pcol + u[0] + "/" + extra_url;
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}
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function new_ws(urlpath, protocol)
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{
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return new WebSocket(urlpath, protocol);
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}
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document.addEventListener("DOMContentLoaded", function() {
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var ws = new_ws(get_appropriate_ws_url(""), "lws-minimal");
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try {
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ws.onopen = function() {
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document.getElementById("r").disabled = 0;
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};
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ws.onmessage =function got_packet(msg) {
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var n, s = "";
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ring[head] = msg.data + "\n";
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head = (head + 1) % 50;
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if (tail === head)
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tail = (tail + 1) % 50;
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n = tail;
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do {
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s = s + ring[n];
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n = (n + 1) % 50;
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} while (n !== head);
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document.getElementById("r").value = s;
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document.getElementById("r").scrollTop =
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document.getElementById("r").scrollHeight;
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};
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ws.onclose = function(){
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document.getElementById("r").disabled = 1;
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};
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} catch(exception) {
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alert("<p>Error " + exception);
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}
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}, false);
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Binary file not shown.
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After Width: | Height: | Size: 1.4 KiB |
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@ -0,0 +1,19 @@
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<html>
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<head>
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<meta charset=utf-8 http-equiv="Content-Language" content="en"/>
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<script src="/example.js"></script>
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</head>
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<body>
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<img src="libwebsockets.org-logo.svg">
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<img src="strict-csp.svg"><br>
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<b>Minimal ws server threads SMP example</b>.<br>
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Strings generated by server threads are sent to
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all browsers open on this page.<br>
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The textarea show the last 50 lines received.
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<br>
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<br>
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<textarea id=r readonly cols=80 rows=50></textarea><br>
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</body>
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</html>
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|
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@ -0,0 +1,66 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<svg width="117.26mm" height="19.676mm" version="1.1" viewBox="0 0 117.26 19.677" xmlns="http://www.w3.org/2000/svg" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
|
||||
<metadata>
|
||||
<rdf:RDF>
|
||||
<cc:Work rdf:about="">
|
||||
<dc:format>image/svg+xml</dc:format>
|
||||
<dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage"/>
|
||||
<dc:title/>
|
||||
</cc:Work>
|
||||
</rdf:RDF>
|
||||
</metadata>
|
||||
<path d="m0-2.6715e-4h117.26v19.677h-117.26z" fill="none"/>
|
||||
<g transform="matrix(.63895 0 0 .63895 2.5477 3.6562)">
|
||||
<g transform="matrix(.9517 0 0 .9517 3.2398 -93.904)">
|
||||
<path d="m9.5909 107.4h2.5567v2.649h-2.5567z"/>
|
||||
<path d="m12.12 107.36a1.2625 1.2625 0 0 1-1.2625 1.262 1.2625 1.2625 0 0 1-1.2625-1.262 1.2625 1.2625 0 0 1 1.2625-1.262 1.2625 1.2625 0 0 1 1.2625 1.262" stroke-linecap="round" stroke-width="1.0365"/>
|
||||
<path d="m12.127 110.05a1.2625 1.2625 0 0 1-1.2625 1.262 1.2625 1.2625 0 0 1-1.2625-1.262 1.2625 1.2625 0 0 1 1.2625-1.262 1.2625 1.2625 0 0 1 1.2625 1.262" stroke-linecap="round" stroke-width="1.0365"/>
|
||||
</g>
|
||||
<path d="m12.174 13.987a1.2015 1.2015 0 0 1-1.2024 1.2024 1.2015 1.2015 0 0 1-1.2006-1.2024 1.2015 1.2015 0 0 1 1.2006-1.2005 1.2015 1.2015 0 0 1 1.2024 1.2005" stroke-linecap="round" stroke-width=".98647"/>
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||||
<path d="m8.2754 5.0474h2.468v5.6755h-2.468z"/>
|
||||
<path d="m16.25 13.965a1.2015 1.2015 0 0 1-1.2027 1.2005 1.2015 1.2015 0 0 1-1.2004-1.2005 1.2015 1.2015 0 0 1 1.2004-1.2025 1.2015 1.2015 0 0 1 1.2027 1.2025" stroke-linecap="round" stroke-width=".98647"/>
|
||||
<path d="m19.545 13.928a1.2015 1.2015 0 0 1-1.2025 1.2026 1.2015 1.2015 0 0 1-1.2003-1.2026 1.2015 1.2015 0 0 1 1.2003-1.2005 1.2015 1.2015 0 0 1 1.2025 1.2005" stroke-linecap="round" stroke-width=".98647"/>
|
||||
<path d="m23.75 13.902a1.2015 1.2015 0 0 1-1.2005 1.2024 1.2015 1.2015 0 0 1-1.2025-1.2024 1.2015 1.2015 0 0 1 1.2025-1.2005 1.2015 1.2015 0 0 1 1.2005 1.2005" stroke-linecap="round" stroke-width=".98647"/>
|
||||
<path d="m26.249 5.0292a1.2015 1.2015 0 0 1-1.2027 1.2004 1.2015 1.2015 0 0 1-1.2004-1.2004 1.2015 1.2015 0 0 1 1.2004-1.2026 1.2015 1.2015 0 0 1 1.2027 1.2026" stroke-linecap="round" stroke-width=".98647"/>
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<g transform="matrix(.9517 0 0 .9517 6.3252 -93.961)">
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<path d="m9.5909 107.4h2.5567v2.649h-2.5567z"/>
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<path d="m12.12 107.36a1.2625 1.2625 0 0 1-1.2625 1.262 1.2625 1.2625 0 0 1-1.2625-1.262 1.2625 1.2625 0 0 1 1.2625-1.262 1.2625 1.2625 0 0 1 1.2625 1.262" stroke-linecap="round" stroke-width="1.0365"/>
|
||||
<path d="m12.127 110.05a1.2625 1.2625 0 0 1-1.2625 1.262 1.2625 1.2625 0 0 1-1.2625-1.262 1.2625 1.2625 0 0 1 1.2625-1.262 1.2625 1.2625 0 0 1 1.2625 1.262" stroke-linecap="round" stroke-width="1.0365"/>
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</g>
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<g transform="matrix(.9517 0 0 .9517 9.3806 -93.988)">
|
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<path d="m9.5909 107.4h2.5567v2.649h-2.5567z"/>
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<path d="m12.12 107.36a1.2625 1.2625 0 0 1-1.2625 1.262 1.2625 1.2625 0 0 1-1.2625-1.262 1.2625 1.2625 0 0 1 1.2625-1.262 1.2625 1.2625 0 0 1 1.2625 1.262" stroke-linecap="round" stroke-width="1.0365"/>
|
||||
<path d="m12.127 110.05a1.2625 1.2625 0 0 1-1.2625 1.262 1.2625 1.2625 0 0 1-1.2625-1.262 1.2625 1.2625 0 0 1 1.2625-1.262 1.2625 1.2625 0 0 1 1.2625 1.262" stroke-linecap="round" stroke-width="1.0365"/>
|
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</g>
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<g transform="matrix(.9517 0 0 .9517 13.506 -94.006)">
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||||
<path d="m9.5909 107.4h2.5567v2.649h-2.5567z"/>
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<path d="m-332.03-22.859q0 0.46434-0.33683 0.72417-0.33682 0.25984-0.91423 0.25984-0.62553 0-0.96236-0.1612v-0.39456q0.21653 0.09142 0.47155 0.14435 0.25503 0.05293 0.50524 0.05293 0.409 0 0.61591-0.15398 0.20691-0.15638 0.20691-0.43306 0-0.18285-0.0746-0.29833-0.0722-0.11789-0.2454-0.21653-0.17082-0.09864-0.52208-0.22375-0.4908-0.17563-0.70252-0.41622-0.20931-0.24059-0.20931-0.62794 0-0.4066 0.30555-0.64718t0.80838-0.24059q0.52448 0 0.96476 0.19247l-0.12751 0.35607q-0.43547-0.18285-0.84687-0.18285-0.3248 0-0.50765 0.13954-0.18284 0.13954-0.18284 0.38735 0 0.18285 0.0674 0.30074 0.0674 0.11548 0.22615 0.21412 0.1612 0.09624 0.4908 0.21412 0.55336 0.19728 0.76027 0.42344 0.20931 0.22615 0.20931 0.58704z"/>
|
||||
<path d="m-330.26-21.875q-0.58463 0-0.92386-0.35607-0.33683-0.35607-0.33683-0.98882 0-0.63756 0.31277-1.0129 0.31517-0.37532 0.84446-0.37532 0.49562 0 0.78432 0.3272 0.28871 0.3248 0.28871 0.8589v0.25262h-1.8164q0.012 0.46434 0.23338 0.70492 0.22374 0.24059 0.62793 0.24059 0.42584 0 0.84206-0.17804v0.35607q-0.21171 0.09142-0.40178 0.12992-0.18766 0.0409-0.45471 0.0409zm-0.10827-2.3987q-0.31757 0-0.50764 0.20691-0.18766 0.20691-0.22134 0.5726h1.3786q0-0.37772-0.16841-0.57741-0.16841-0.2021-0.48118-0.2021z"/>
|
||||
<path d="m-327.56-21.875q-0.5726 0-0.88777-0.35126-0.31277-0.35366-0.31277-0.99844 0-0.66162 0.31758-1.0225 0.31998-0.36088 0.90942-0.36088 0.19007 0 0.38013 0.0409 0.19007 0.0409 0.29833 0.09624l-0.1227 0.33923q-0.13232-0.05293-0.2887-0.08661-0.15639-0.03609-0.27668-0.03609-0.80357 0-0.80357 1.0249 0 0.48599 0.19488 0.74582 0.19728 0.25984 0.58223 0.25984 0.3296 0 0.67605-0.14195v0.35366q-0.26465 0.13714-0.66643 0.13714z"/>
|
||||
<path d="m-325.89-24.56v1.7106q0 0.32239 0.14676 0.48118 0.14675 0.15879 0.45952 0.15879 0.41381 0 0.60388-0.22615 0.19247-0.22615 0.19247-0.73861v-1.3858h0.39938v2.6369h-0.32961l-0.0577-0.35367h-0.0217q-0.1227 0.19488-0.34163 0.29833-0.21653 0.10345-0.49561 0.10345-0.48118 0-0.72177-0.22856-0.23818-0.22856-0.23818-0.73139v-1.725z"/>
|
||||
<path d="m-322.04-24.608q0.17563 0 0.31517 0.02887l-0.0553 0.37051q-0.1636-0.03609-0.2887-0.03609-0.31999 0-0.54855 0.25984-0.22615 0.25984-0.22615 0.64718v1.4147h-0.39938v-2.6369h0.32961l0.0457 0.4884h0.0192q0.14676-0.25743 0.35366-0.39697 0.20691-0.13954 0.45472-0.13954z"/>
|
||||
<path d="m-320.83-21.923h-0.39938v-2.6369h0.39938zm-0.43306-3.3514q0-0.13714 0.0674-0.19969 0.0674-0.06496 0.16841-0.06496 0.0962 0 0.16601 0.06496 0.0698 0.06496 0.0698 0.19969 0 0.13473-0.0698 0.2021-0.0698 0.06496-0.16601 0.06496-0.10105 0-0.16841-0.06496-0.0674-0.06736-0.0674-0.2021z"/>
|
||||
<path d="m-319.13-22.205q0.10586 0 0.2045-0.01443 0.0986-0.01684 0.15638-0.03368v0.30555q-0.065 0.03128-0.19247 0.05052-0.1251 0.02165-0.22615 0.02165-0.76507 0-0.76507-0.80597v-1.5686h-0.37773v-0.19247l0.37773-0.16601 0.16841-0.56298h0.23096v0.6111h0.76508v0.31036h-0.76508v1.5518q0 0.23818 0.11308 0.3657t0.31036 0.12751z"/>
|
||||
<path d="m-318.66-24.56h0.42825l0.57742 1.5037q0.19006 0.51486 0.23577 0.74342h0.0192q0.0313-0.1227 0.12992-0.41862 0.10105-0.29833 0.6544-1.8285h0.42825l-1.1332 3.0025q-0.16841 0.44509-0.39456 0.63034-0.22375 0.18766-0.55095 0.18766-0.18285 0-0.36088-0.0409v-0.31998q0.13232 0.02887 0.29592 0.02887 0.41141 0 0.58704-0.46193l0.14676-0.37532z"/>
|
||||
</g>
|
||||
<g transform="matrix(.70929 0 0 .70929 -99.465 -12.686)" stroke-width=".32334px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal" aria-label="Policy">
|
||||
<path d="m-329.37-19.254q0 0.53256-0.36464 0.82043-0.36224 0.28547-1.0387 0.28547h-0.41261v1.3794h-0.40782v-3.5072h0.90919q1.3146 0 1.3146 1.0219zm-1.816 0.75566h0.36703q0.54215 0 0.78445-0.17512 0.24229-0.17512 0.24229-0.56135 0-0.34784-0.2279-0.51817t-0.71008-0.17032h-0.45579z"/>
|
||||
<path d="m-326.43-18.086q0 0.64291-0.32386 1.0051-0.32385 0.35984-0.89479 0.35984-0.35264 0-0.62612-0.16552t-0.42221-0.47498q-0.14873-0.30946-0.14873-0.72447 0-0.64291 0.32145-1.0003 0.32146-0.35984 0.8924-0.35984 0.55175 0 0.8756 0.36703 0.32626 0.36704 0.32626 0.99315zm-2.0031 0q0 0.50377 0.20151 0.76765t0.59253 0.26388q0.39103 0 0.59254-0.26148 0.2039-0.26388 0.2039-0.77005 0-0.50137-0.2039-0.76046-0.20151-0.26148-0.59733-0.26148-0.39103 0-0.59014 0.25668-0.19911 0.25668-0.19911 0.76525z"/>
|
||||
<path d="m-325.33-16.769h-0.39822v-3.7327h0.39822z"/>
|
||||
<path d="m-324.09-16.769h-0.39822v-2.6292h0.39822zm-0.43181-3.3417q0-0.13674 0.0672-0.19911 0.0672-0.06477 0.16793-0.06477 0.0959 0 0.16552 0.06477 0.0696 0.06477 0.0696 0.19911t-0.0696 0.20151q-0.0696 0.06477-0.16552 0.06477-0.10076 0-0.16793-0.06477-0.0672-0.06717-0.0672-0.20151z"/>
|
||||
<path d="m-322.19-16.721q-0.57094 0-0.8852-0.35024-0.31186-0.35264-0.31186-0.99555 0-0.6597 0.31666-1.0195 0.31906-0.35984 0.90679-0.35984 0.18951 0 0.37903 0.04078 0.18951 0.04078 0.29746 0.09596l-0.12234 0.33825q-0.13194-0.05278-0.28787-0.08636-0.15593-0.03598-0.27588-0.03598-0.80123 0-0.80123 1.0219 0 0.48458 0.19431 0.74366 0.19671 0.25908 0.58054 0.25908 0.32865 0 0.67409-0.14154v0.35264q-0.26388 0.13674-0.6645 0.13674z"/>
|
||||
<path d="m-321.31-19.398h0.427l0.57574 1.4993q0.18952 0.51337 0.2351 0.74127h0.0192q0.0312-0.12234 0.12954-0.41741 0.10076-0.29747 0.65251-1.8232h0.427l-1.1299 2.9938q-0.16792 0.4438-0.39342 0.62852-0.2231 0.18712-0.54935 0.18712-0.18232 0-0.35984-0.04078v-0.31906q0.13194 0.02879 0.29507 0.02879 0.41021 0 0.58533-0.46059l0.14634-0.37423z"/>
|
||||
</g>
|
||||
</g>
|
||||
</g>
|
||||
</svg>
|
||||
|
After Width: | Height: | Size: 12 KiB |
|
|
@ -0,0 +1,321 @@
|
|||
/*
|
||||
* ws protocol handler plugin for "lws-minimal" demonstrating multithread
|
||||
*
|
||||
* Written in 2010-2019 by Andy Green <andy@warmcat.com>
|
||||
*
|
||||
* This file is made available under the Creative Commons CC0 1.0
|
||||
* Universal Public Domain Dedication.
|
||||
*/
|
||||
|
||||
#if !defined (LWS_PLUGIN_STATIC)
|
||||
#define LWS_DLL
|
||||
#define LWS_INTERNAL
|
||||
#include <libwebsockets.h>
|
||||
#endif
|
||||
|
||||
#include <string.h>
|
||||
#include <assert.h>
|
||||
|
||||
/* one of these created for each message in the ringbuffer */
|
||||
|
||||
struct msg {
|
||||
void *payload; /* is malloc'd */
|
||||
size_t len;
|
||||
};
|
||||
|
||||
/*
|
||||
* One of these is created for each client connecting to us.
|
||||
*
|
||||
* It is ONLY read or written from the lws service thread context.
|
||||
*/
|
||||
|
||||
struct per_session_data__minimal {
|
||||
struct per_session_data__minimal *pss_list;
|
||||
struct lws *wsi;
|
||||
uint32_t tail;
|
||||
};
|
||||
|
||||
/*
|
||||
* One of these is created for each vhost our protocol is used with, that
|
||||
* means it is a shared resource between the SMP threads and must be locked.
|
||||
*/
|
||||
|
||||
struct per_vhost_data__minimal {
|
||||
struct lws_context *context;
|
||||
struct lws_vhost *vhost;
|
||||
const struct lws_protocols *protocol;
|
||||
|
||||
struct per_session_data__minimal *pss_list; /* linked-list of live pss*/
|
||||
pthread_t pthread_spam[2];
|
||||
|
||||
pthread_mutex_t lock_ring; /* serialize access to the ring buffer */
|
||||
struct lws_ring *ring; /* {lock_ring} ringbuffer holding unsent content */
|
||||
|
||||
const char *config;
|
||||
char finished;
|
||||
};
|
||||
|
||||
#if defined(WIN32)
|
||||
static void usleep(unsigned long l) { Sleep(l / 1000); }
|
||||
#endif
|
||||
|
||||
/*
|
||||
* This runs under both lws service and "spam threads" contexts.
|
||||
* Access is serialized by vhd->lock_ring.
|
||||
*/
|
||||
|
||||
static void
|
||||
__minimal_destroy_message(void *_msg)
|
||||
{
|
||||
struct msg *msg = _msg;
|
||||
|
||||
free(msg->payload);
|
||||
msg->payload = NULL;
|
||||
msg->len = 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* This runs under the "spam thread" thread context only.
|
||||
*
|
||||
* We spawn two threads that generate messages with this.
|
||||
*
|
||||
*/
|
||||
|
||||
static void *
|
||||
thread_spam(void *d)
|
||||
{
|
||||
struct per_vhost_data__minimal *vhd =
|
||||
(struct per_vhost_data__minimal *)d;
|
||||
struct msg amsg;
|
||||
int len = 128, index = 1, n, whoami = 0;
|
||||
|
||||
for (n = 0; n < (int)LWS_ARRAY_SIZE(vhd->pthread_spam); n++)
|
||||
if (pthread_equal(pthread_self(), vhd->pthread_spam[n]))
|
||||
whoami = n + 1;
|
||||
|
||||
do {
|
||||
pthread_mutex_lock(&vhd->lock_ring); /* --------- ring lock { */
|
||||
|
||||
/* don't generate output if nobody connected */
|
||||
if (!vhd->pss_list)
|
||||
goto wait_unlock;
|
||||
|
||||
/* only create if space in ringbuffer */
|
||||
n = (int)lws_ring_get_count_free_elements(vhd->ring);
|
||||
if (!n) {
|
||||
// lwsl_user("dropping!\n");
|
||||
goto wait_unlock;
|
||||
}
|
||||
|
||||
amsg.payload = malloc(LWS_PRE + len);
|
||||
if (!amsg.payload) {
|
||||
lwsl_user("OOM: dropping\n");
|
||||
goto wait_unlock;
|
||||
}
|
||||
n = lws_snprintf((char *)amsg.payload + LWS_PRE, len,
|
||||
"%s: spam tid: %d, msg: %d", vhd->config,
|
||||
whoami, index++);
|
||||
amsg.len = n;
|
||||
n = (int)lws_ring_insert(vhd->ring, &amsg, 1);
|
||||
if (n != 1) {
|
||||
__minimal_destroy_message(&amsg);
|
||||
// lwsl_user("dropping!\n");
|
||||
} else
|
||||
/*
|
||||
* This will cause a LWS_CALLBACK_EVENT_WAIT_CANCELLED
|
||||
* in the lws service thread context.
|
||||
*/
|
||||
lws_cancel_service(vhd->context);
|
||||
|
||||
wait_unlock:
|
||||
pthread_mutex_unlock(&vhd->lock_ring); /* } ring lock ------- */
|
||||
|
||||
usleep(100000);
|
||||
|
||||
} while (!vhd->finished);
|
||||
|
||||
lwsl_notice("thread_spam %d exiting\n", whoami);
|
||||
|
||||
pthread_exit(NULL);
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* this runs under the lws service thread context only */
|
||||
|
||||
static int
|
||||
callback_minimal(struct lws *wsi, enum lws_callback_reasons reason,
|
||||
void *user, void *in, size_t len)
|
||||
{
|
||||
struct per_session_data__minimal *pss =
|
||||
(struct per_session_data__minimal *)user;
|
||||
struct per_vhost_data__minimal *vhd =
|
||||
(struct per_vhost_data__minimal *)
|
||||
lws_protocol_vh_priv_get(lws_get_vhost(wsi),
|
||||
lws_get_protocol(wsi));
|
||||
const struct lws_protocol_vhost_options *pvo;
|
||||
const struct msg *pmsg;
|
||||
char temp[LWS_PRE + 256];
|
||||
void *retval;
|
||||
int n, m, r = 0;
|
||||
|
||||
switch (reason) {
|
||||
case LWS_CALLBACK_PROTOCOL_INIT:
|
||||
/* create our per-vhost struct */
|
||||
vhd = lws_protocol_vh_priv_zalloc(lws_get_vhost(wsi),
|
||||
lws_get_protocol(wsi),
|
||||
sizeof(struct per_vhost_data__minimal));
|
||||
if (!vhd)
|
||||
return 1;
|
||||
|
||||
pthread_mutex_init(&vhd->lock_ring, NULL);
|
||||
|
||||
/* recover the pointer to the globals struct */
|
||||
pvo = lws_pvo_search(
|
||||
(const struct lws_protocol_vhost_options *)in,
|
||||
"config");
|
||||
if (!pvo || !pvo->value) {
|
||||
lwsl_err("%s: Can't find \"config\" pvo\n", __func__);
|
||||
return 1;
|
||||
}
|
||||
vhd->config = pvo->value;
|
||||
|
||||
vhd->context = lws_get_context(wsi);
|
||||
vhd->protocol = lws_get_protocol(wsi);
|
||||
vhd->vhost = lws_get_vhost(wsi);
|
||||
|
||||
vhd->ring = lws_ring_create(sizeof(struct msg), 8,
|
||||
__minimal_destroy_message);
|
||||
if (!vhd->ring) {
|
||||
lwsl_err("%s: failed to create ring\n", __func__);
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* start the content-creating threads */
|
||||
|
||||
for (n = 0; n < (int)LWS_ARRAY_SIZE(vhd->pthread_spam); n++)
|
||||
if (pthread_create(&vhd->pthread_spam[n], NULL,
|
||||
thread_spam, vhd)) {
|
||||
lwsl_err("thread creation failed\n");
|
||||
r = 1;
|
||||
goto init_fail;
|
||||
}
|
||||
break;
|
||||
|
||||
case LWS_CALLBACK_PROTOCOL_DESTROY:
|
||||
init_fail:
|
||||
vhd->finished = 1;
|
||||
for (n = 0; n < (int)LWS_ARRAY_SIZE(vhd->pthread_spam); n++)
|
||||
pthread_join(vhd->pthread_spam[n], &retval);
|
||||
|
||||
if (vhd->ring)
|
||||
lws_ring_destroy(vhd->ring);
|
||||
|
||||
pthread_mutex_destroy(&vhd->lock_ring);
|
||||
break;
|
||||
|
||||
case LWS_CALLBACK_ESTABLISHED:
|
||||
/* add ourselves to the list of live pss held in the vhd */
|
||||
pthread_mutex_lock(&vhd->lock_ring);
|
||||
lws_ll_fwd_insert(pss, pss_list, vhd->pss_list);
|
||||
pss->tail = lws_ring_get_oldest_tail(vhd->ring);
|
||||
pss->wsi = wsi;
|
||||
pthread_mutex_unlock(&vhd->lock_ring);
|
||||
break;
|
||||
|
||||
case LWS_CALLBACK_CLOSED:
|
||||
/* doesn't reference ring */
|
||||
pthread_mutex_lock(&vhd->lock_ring);
|
||||
/* remove our closing pss from the list of live pss */
|
||||
lws_ll_fwd_remove(struct per_session_data__minimal, pss_list,
|
||||
pss, vhd->pss_list);
|
||||
pthread_mutex_unlock(&vhd->lock_ring);
|
||||
break;
|
||||
|
||||
case LWS_CALLBACK_SERVER_WRITEABLE:
|
||||
pthread_mutex_lock(&vhd->lock_ring); /* --------- ring lock { */
|
||||
|
||||
pmsg = lws_ring_get_element(vhd->ring, &pss->tail);
|
||||
if (!pmsg) {
|
||||
pthread_mutex_unlock(&vhd->lock_ring); /* } ring lock ------- */
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
assert(pmsg->payload);
|
||||
|
||||
n = lws_snprintf(temp + LWS_PRE, sizeof(temp) - LWS_PRE,
|
||||
"svc, %s",
|
||||
(char *)pmsg->payload + LWS_PRE);
|
||||
|
||||
/* notice we allowed for LWS_PRE in the payload already */
|
||||
m = lws_write(wsi, (unsigned char *)temp + LWS_PRE, n,
|
||||
LWS_WRITE_TEXT);
|
||||
if (m < n) {
|
||||
pthread_mutex_unlock(&vhd->lock_ring); /* } ring lock ------- */
|
||||
|
||||
lwsl_err("ERROR %d writing to ws socket\n", m);
|
||||
return -1;
|
||||
}
|
||||
|
||||
lws_ring_consume_and_update_oldest_tail(
|
||||
vhd->ring, /* lws_ring object */
|
||||
struct per_session_data__minimal, /* type of objects with tails */
|
||||
&pss->tail, /* tail of guy doing the consuming */
|
||||
1, /* number of payload objects being consumed */
|
||||
vhd->pss_list, /* head of list of objects with tails */
|
||||
tail, /* member name of tail in objects with tails */
|
||||
pss_list /* member name of next object in objects with tails */
|
||||
);
|
||||
|
||||
/* more to do? */
|
||||
if (lws_ring_get_element(vhd->ring, &pss->tail))
|
||||
/* come back as soon as we can write more */
|
||||
lws_callback_on_writable(pss->wsi);
|
||||
|
||||
pthread_mutex_unlock(&vhd->lock_ring); /* } ring lock ------- */
|
||||
|
||||
break;
|
||||
|
||||
case LWS_CALLBACK_RECEIVE:
|
||||
break;
|
||||
|
||||
case LWS_CALLBACK_EVENT_WAIT_CANCELLED:
|
||||
// lwsl_notice("EVENT_WAIT_CANCELLED tsi %d\n", lws_wsi_tsi(wsi));
|
||||
if (!vhd)
|
||||
break;
|
||||
/*
|
||||
* When the "spam" threads add a message to the ringbuffer,
|
||||
* they create this event in the lws service thread context
|
||||
* using lws_cancel_service().
|
||||
*
|
||||
* We respond by scheduling a writable callback for all
|
||||
* connected clients.
|
||||
*/
|
||||
|
||||
pthread_mutex_lock(&vhd->lock_ring); /* --------- ring lock { */
|
||||
|
||||
lws_start_foreach_llp(struct per_session_data__minimal **,
|
||||
ppss, vhd->pss_list) {
|
||||
if (lws_wsi_tsi((*ppss)->wsi) == lws_wsi_tsi(wsi))
|
||||
lws_callback_on_writable((*ppss)->wsi);
|
||||
} lws_end_foreach_llp(ppss, pss_list);
|
||||
|
||||
pthread_mutex_unlock(&vhd->lock_ring); /* } ring lock ------- */
|
||||
break;
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
#define LWS_PLUGIN_PROTOCOL_MINIMAL \
|
||||
{ \
|
||||
"lws-minimal", \
|
||||
callback_minimal, \
|
||||
sizeof(struct per_session_data__minimal), \
|
||||
128, \
|
||||
0, NULL, 0 \
|
||||
}
|
||||
Loading…
Add table
Reference in a new issue