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pthread_mutex_trylock(3)

NAME

     pthread_mutex_trylock -- attempt to lock a mutex without blocking

LIBRARY

     Reentrant C Library (libc_r, -lc_r)
     POSIX Threads Library (libpthread, -lpthread)
     1:1 Threading Library (libthr, -lthr)

SYNOPSIS

     #include <pthread.h>

     int
     pthread_mutex_trylock(pthread_mutex_t *mutex);

DESCRIPTION

     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.

RETURN VALUES

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

ERRORS

     The pthread_mutex_trylock() function will fail if:

     [EINVAL]		The value specified by mutex is invalid.

     [EBUSY]		Mutex is already locked.

SEE ALSO

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

STANDARDS

     The pthread_mutex_trylock() function conforms to ISO/IEC 9945-1:1996
     (``POSIX.1'').

FreeBSD 5.4			 July 30, 1998			   FreeBSD 5.4

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