static void try_lock_mutex_test(void) { int i, res; ethr_tid tid; res = ethr_mutex_init(&tlmt_mtx1); ASSERT(res == 0); res = ethr_mutex_init(&tlmt_mtx2); ASSERT(res == 0); res = ethr_cond_init(&tlmt_cnd2); ASSERT(res == 0); tlmt_mtx1_locked = 0; tlmt_mtx1_do_unlock = 0; res = ethr_thr_create(&tid, tlmt_thread, NULL, NULL); ASSERT(res == 0); ethr_mutex_lock(&tlmt_mtx2); while (!tlmt_mtx1_locked) { res = ethr_cond_wait(&tlmt_cnd2, &tlmt_mtx2); ASSERT(res == 0 || res == EINTR); } ethr_mutex_unlock(&tlmt_mtx2); for (i = 0; i < 10; i++) { res = ethr_mutex_trylock(&tlmt_mtx1); ASSERT(res == EBUSY); } ethr_mutex_lock(&tlmt_mtx2); tlmt_mtx1_do_unlock = 1; ethr_cond_signal(&tlmt_cnd2); while (tlmt_mtx1_locked) { res = ethr_cond_wait(&tlmt_cnd2, &tlmt_mtx2); ASSERT(res == 0 || res == EINTR); } ethr_mutex_unlock(&tlmt_mtx2); res = ethr_mutex_trylock(&tlmt_mtx1); ASSERT(res == 0); ethr_mutex_unlock(&tlmt_mtx1); res = ethr_thr_join(tid, NULL); ASSERT(res == 0); res = ethr_mutex_destroy(&tlmt_mtx1); ASSERT(res == 0); res = ethr_mutex_destroy(&tlmt_mtx2); ASSERT(res == 0); res = ethr_cond_destroy(&tlmt_cnd2); ASSERT(res == 0); }
int erl_drv_mutex_trylock(ErlDrvMutex *dmtx) { #ifdef USE_THREADS if (!dmtx) fatal_error(EINVAL, "erl_drv_mutex_trylock()"); return ethr_mutex_trylock(&dmtx->mtx); #else return 0; #endif }
int erl_drv_mutex_trylock(ErlDrvMutex *dmtx) { #ifdef USE_THREADS int res = dmtx ? ethr_mutex_trylock(&dmtx->mtx) : EINVAL; if (res != 0 && res != EBUSY) fatal_error(res, "erl_drv_mutex_trylock()"); return res; #else return 0; #endif }