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Man Pages
PTHREAD_MUTEX_TRYLOCK(3) FreeBSD Library Functions Manual PTHREAD_MUTEX_TRYLOCK(3)

pthread_mutex_trylock
attempt to lock a mutex without blocking

POSIX Threads Library (libpthread, -lpthread)

#include <pthread.h>
int
pthread_mutex_trylock(pthread_mutex_t *mutex);

The pthread_mutex_trylock() function locks mutex. If the mutex is already locked, pthread_mutex_trylock() will not block waiting for the mutex, but will return an error condition.

If successful, pthread_mutex_trylock() will return zero, otherwise an error number will be returned to indicate the error.

The pthread_mutex_trylock() function will fail if:
[]
The value specified by mutex is invalid.
[]
Mutex is already locked.
[]
The argument mutex points to a robust mutex and the previous owning thread terminated while holding the mutex lock. The lock was granted to the caller and it is up to the new owner to make the state consistent.
[]
The state protected by the mutex is not recoverable.

pthread_mutex_consistent(3), pthread_mutex_destroy(3), pthread_mutex_init(3), pthread_mutex_lock(3), pthread_mutex_unlock(3)

The pthread_mutex_trylock() function conforms to ISO/IEC 9945-1:1996 (“POSIX.1”).
April 29, 2016 FreeBSD 12.0-RELEASE

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