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first steps to realize a Lubachevsky barrier with flag

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This commit is contained in:
Stefan Lankes 2011-11-08 01:03:27 -08:00
parent 198c1dcebd
commit 4c61e37fca
1 changed files with 25 additions and 0 deletions
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25
arch/x86/mm/svm.c
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@ -37,8 +37,19 @@
#define SHARED_PAGES ((4*RCCE_SHM_SIZE_MAX) >> PAGE_SHIFT)
#define OWNER_SIZE ((SHARED_PAGES * sizeof(uint8_t) + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1))
#define AIREG1 0
#define AIREG2 (AIREG1 + 1)
t_vcharp RC_SHM_BUFFER_START();
typedef struct {
int counter;
int initializer;
} atomic_increg_t;
static volatile atomic_increg_t *incregs = NULL;
static RCCE_FLAG release;
/*
* This array describes the owner of a specific page.
* Only the owner of a page is able to change the possession.
@ -343,12 +354,26 @@ void svm_flush(void)
int svm_barrier(uint32_t type)
{
int i;
RCCE_COMM *comm = &RCCE_COMM_WORLD;
static int index = 0;
if (type == SVM_LAZYRELEASE) {
svm_flush();
svm_invalidate();
}
#if 0
index = !index;
if (incregs[AIREG1].counter > (comm->size - 2)) {
incregs[AIREG1].initializer = 0;
while(incregs[AIREG1].initializer);
for (i = 0; i < comm->size; i++)
RCCE_flag_write(&release, index, comm->member[i]);
} else RCCE_wait_until(release, index);
#else
RCCE_barrier(&RCCE_COMM_WORLD);
#endif
return 0;
}