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Rewrite Windows poll()

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We can now await signals, files, pipes, and console simultaneously. This
change also gives a deeper review and testing to changes made yesterday.
This commit is contained in:
Justine Tunney 2024-09-10 18:59:06 -07:00
parent cceddd21b2
commit fbdf9d028c
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GPG key ID: BE714B4575D6E328
15 changed files with 425 additions and 191 deletions
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23
libc/thread/pthread_cond_timedwait.c
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@ -31,11 +31,21 @@
#include "third_party/nsync/futex.internal.h"
#include "third_party/nsync/time.h"
__static_yoink("nsync_mu_lock");
__static_yoink("nsync_mu_unlock");
__static_yoink("nsync_mu_trylock");
struct PthreadWait {
pthread_cond_t *cond;
pthread_mutex_t *mutex;
};
static bool can_use_nsync(uint64_t muword) {
return !IsXnuSilicon() && //
MUTEX_TYPE(muword) == PTHREAD_MUTEX_NORMAL &&
MUTEX_PSHARED(muword) == PTHREAD_PROCESS_PRIVATE;
}
static void pthread_cond_leave(void *arg) {
struct PthreadWait *wait = (struct PthreadWait *)arg;
if (pthread_mutex_lock(wait->mutex))
@ -117,19 +127,20 @@ errno_t pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
MUTEX_OWNER(muword) != gettid())
return EPERM;
// if the cond is process shared then the mutex needs to be too
if ((cond->_pshared == PTHREAD_PROCESS_SHARED) ^
(MUTEX_PSHARED(muword) == PTHREAD_PROCESS_SHARED))
return EINVAL;
#if PTHREAD_USE_NSYNC
// the first time pthread_cond_timedwait() is called we learn if the
// associated mutex is normal and private. that means *NSYNC is safe
// this decision is permanent. you can't use a recursive mutex later
if (!atomic_load_explicit(&cond->_waited, memory_order_acquire)) {
if (!cond->_footek)
if (MUTEX_TYPE(muword) != PTHREAD_MUTEX_NORMAL ||
MUTEX_PSHARED(muword) != PTHREAD_PROCESS_PRIVATE)
cond->_footek = true;
cond->_footek = !can_use_nsync(muword);
atomic_store_explicit(&cond->_waited, true, memory_order_release);
} else if (!cond->_footek) {
if (MUTEX_TYPE(muword) != PTHREAD_MUTEX_NORMAL ||
MUTEX_PSHARED(muword) != PTHREAD_PROCESS_PRIVATE)
if (!can_use_nsync(muword))
return EINVAL;
}
#endif