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rework openbsd futexes a little

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This commit is contained in:
Colin Davidson
2022-12-29 12:00:16 -08:00
parent 98e5523f2f
commit 27ba1d596c
1 changed files with 13 additions and 6 deletions
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src/threading.cpp
+13 -6
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@@ -512,22 +512,29 @@ typedef std::atomic<int32_t> Futex;
typedef volatile int32_t Footex; typedef volatile int32_t Footex;
gb_internal void tpool_wake_addr(Futex *addr) { gb_internal void tpool_wake_addr(Futex *addr) {
int ret = futex((volatile uint32_t *)addr, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1, NULL, NULL); for (;;) {
if (ret == -1) { int ret = futex((volatile uint32_t *)addr, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1, NULL, NULL);
perror("Futex wake"); if (ret == -1) {
GB_PANIC("futex wake fail"); if (errno == ETIMEDOUT || errno == EINTR) {
continue;
}
perror("Futex wake");
GB_PANIC("futex wake fail");
} else if (ret == 1) {
return;
}
} }
} }
gb_internal void tpool_wait_on_addr(Futex *addr, Footex val) { gb_internal void tpool_wait_on_addr(Futex *addr, Footex val) {
for (;;) { for (;;) {
int ret = futex((volatile uint32_t *)addr, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, val, NULL, NULL); int ret = futex((volatile uint32_t *)addr, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, val, NULL, NULL);
if (ret != -1) { if (ret == -1) {
if (*addr != val) { if (*addr != val) {
return; return;
} }
} else {
if (errno == ETIMEDOUT || errno == EINTR) { if (errno == ETIMEDOUT || errno == EINTR) {
continue; continue;
} }