From b11e31fbfd6744a6d938ebb4a0e85c173386322a Mon Sep 17 00:00:00 2001 From: Chris Robinson Date: Sat, 10 Feb 2018 21:42:45 -0800 Subject: Clear stale 'post's on the event semphaphore --- common/threads.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'common/threads.c') diff --git a/common/threads.c b/common/threads.c index b95cb548..88052d7e 100644 --- a/common/threads.c +++ b/common/threads.c @@ -354,6 +354,14 @@ int alsem_wait(alsem_t *sem) return althrd_error; } +int alsem_trywait(alsem_t *sem) +{ + DWORD ret = WaitForSingleObject(*sem, 0); + if(ret == WAIT_OBJECT_0) return althrd_success; + if(ret == WAIT_TIMEOUT) return althrd_busy; + return althrd_error; +} + /* An associative map of uint:void* pairs. The key is the TLS index (given by * TlsAlloc), and the value is the altss_dtor_t callback. When a thread exits, @@ -664,6 +672,14 @@ int alsem_wait(alsem_t *sem) return althrd_error; } +int alsem_trywait(alsem_t *sem) +{ + if(sem_trywait(sem) == 0) return althrd_success; + if(errno == EWOULDBLOCK) return althrd_busy; + if(errno == EINTR) return -2; + return althrd_error; +} + int altss_create(altss_t *tss_id, altss_dtor_t callback) { -- cgit v1.2.3