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pthread_rwlock_trywrlock(3) [osx man page]

PTHREAD_RWLOCK_WRLOCK(3)				   BSD Library Functions Manual 				  PTHREAD_RWLOCK_WRLOCK(3)

NAME
pthread_rwlock_trywrlock, pthread_rwlock_wrlock -- acquire a read/write lock for writing SYNOPSIS
#include <pthread.h> int pthread_rwlock_trywrlock(pthread_rwlock_t *rwlock); int pthread_rwlock_wrlock(pthread_rwlock_t *rwlock); DESCRIPTION
The pthread_rwlock_wrlock() function blocks until a write lock can be acquired against rwlock. The pthread_rwlock_trywrlock() function per- forms the same action, but does not block if the lock cannot be immediately obtained. The results are undefined if the calling thread already holds the lock at the time the call is made. IMPLEMENTATION NOTES
To prevent writer starvation, writers are favored over readers. RETURN VALUES
If successful, the pthread_rwlock_wrlock() and pthread_rwlock_trywrlock() functions will return zero. Otherwise, an error number will be returned to indicate the error. SEE ALSO
pthread_rwlock_trywrlock(3), pthread_rwlock_unlock(3), pthread_rwlock_wrlock(3) STANDARDS
The pthread_rwlock_wrlock() and pthread_rwlock_trywrlock() functions are expected to conform to Version 2 of the Single UNIX Specification (``SUSv2''). ERRORS
The pthread_rwlock_trywrlock() function will fail if: [EBUSY] The calling thread is not able to acquire the lock without blocking. The pthread_rwlock_wrlock() and pthread_rwlock_trywrlock() functions may fail if: [EDEADLK] The calling thread already owns the read/write lock (for reading or writing). [EINVAL] The value specified by rwlock is invalid. [ENOMEM] Insufficient memory exists to initialize the lock (applies to statically initialized locks only). HISTORY
The pthread_rwlock_wrlock() function first appeared in FreeBSD 3.0. BSD
August 4, 1998 BSD

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PTHREAD_RWLOCK_WRLOCK(3)				   BSD Library Functions Manual 				  PTHREAD_RWLOCK_WRLOCK(3)

NAME
pthread_rwlock_wrlock, pthread_rwlock_trywrlock -- acquire a read/write lock for writing LIBRARY
POSIX Threads Library (libpthread, -lpthread) SYNOPSIS
#include <pthread.h> int pthread_rwlock_wrlock(pthread_rwlock_t *lock); int pthread_rwlock_trywrlock(pthread_rwlock_t *lock); DESCRIPTION
The pthread_rwlock_wrlock() function blocks until a write lock can be acquired against lock. The pthread_rwlock_trywrlock() function per- forms the same action, but does not block if the lock cannot be immediately obtained. The results are undefined if the calling thread already holds the lock at the time the call is made. IMPLEMENTATION NOTES
To prevent writer starvation, writers are favored over readers. RETURN VALUES
If successful, the pthread_rwlock_wrlock() and pthread_rwlock_trywrlock() functions will return zero. Otherwise an error number will be returned to indicate the error. ERRORS
The pthread_rwlock_trywrlock() function will fail if: [EBUSY] The calling thread is not able to acquire the lock without blocking. The pthread_rwlock_wrlock() and pthread_rwlock_trywrlock() functions may fail if: [EDEADLK] The calling thread already owns the read/write lock (for reading or writing). [EINVAL] The value specified by lock is invalid. [ENOMEM] Insufficient memory exists to initialize the lock (applies to statically initialized locks only). SEE ALSO
pthread_rwlock_init(3), pthread_rwlock_rdlock(3), pthread_rwlock_tryrdlock(3), pthread_rwlock_unlock(3) STANDARDS
The pthread_rwlock_wrlock() and pthread_rwlock_trywrlock() functions are expected to conform to Version 2 of the Single UNIX Specification (``SUSv2''). HISTORY
The pthread_rwlock_wrlock() function first appeared in FreeBSD 3.0. BSD
August 4, 1998 BSD
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