pthread: Fixed child pump not being joined right after a fork.

Fixes #125.

src/compat/process.c

@@ -176,13 +176,21 @@ void init_proc_compat(void) {
 #endif
 }
 
-void free_proc_compat(void) {
+void reset_proc_compat(void) {
 #ifndef VANILLA_WIN32
     child_pump_running = false;
     pthread_join(child_pump, NULL);
 #endif
 }
 
+void free_proc_compat(void) {
+#ifndef VANILLA_WIN32
+    if (child_pump_running) {
+        reset_proc_compat();
+    }
+#endif
+}
+
 #ifdef VANILLA_WIN32
 struct wait_context {
     HANDLE wait_handle;

src/compat/process.h

@@ -62,5 +62,6 @@ unsigned long long get_process_id_of(s_proc_handle *proc);
 
 void init_proc_compat(void);
 void free_proc_compat(void);
+void reset_proc_compat(void);
 
 #endif /* !COMPAT_PROCESS_H_ */

src/core/worker.c

@@ -78,6 +78,8 @@ struct event *worker_read_event(struct worker_set *workers, s_pipe_file_handle *
 }
 
 void run_worker(struct worker_context *ctx) {
+    reset_proc_compat();
+
     cr_redirect_stdin();
     g_event_pipe = pipe_out_handle(ctx->pipe, PIPE_CLOSE);