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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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19
src/threading.cpp
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@@ -512,22 +512,29 @@ typedef std::atomic<int32_t> Futex;
typedef volatile int32_t Footex;
gb_internal void tpool_wake_addr(Futex *addr) {
int ret = futex((volatile uint32_t *)addr, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1, NULL, NULL);
if (ret == -1) {
perror("Futex wake");
GB_PANIC("futex wake fail");
for (;;) {
int ret = futex((volatile uint32_t *)addr, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1, NULL, NULL);
if (ret == -1) {
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) {
for (;;) {
int ret = futex((volatile uint32_t *)addr, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, val, NULL, NULL);
if (ret != -1) {
if (ret == -1) {
if (*addr != val) {
return;
}
} else {
if (errno == ETIMEDOUT || errno == EINTR) {
continue;
}