PTHREAD_RWLOCKATTR_GE... BSD Library Functions Manual PTHREAD_RWLOCKATTR_GE...
pthread_rwlockattr_getpshared -- get the process shared attribute
#include <pthread.h> int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *attr, int *pshared);
The pthread_rwlockattr_getpshared() function is used to get the process shared setting of a read/write lock attribute object. The setting is returned via pshared, and may be one of two values: PTHREAD_PROCESS_SHARED Any thread of any process that has access to the memory where the read/write lock resides can manipulate the lock. PTHREAD_PROCESS_PRIVATE Only threads created within the same process as the thread that initialized the read/write lock can manipulate the lock. This is the default value.
If successful, the pthread_rwlockattr_getpshared() function will return zero. Otherwise an error number will be returned to indicate the error.
The pthread_rwlockattr_getpshared() function may fail if: [EINVAL] The value specified by attr is invalid.
The pthread_rwlockattr_getpshared() function is expected to conform to Version 2 of the Single UNIX Specification (``SUSv2'').
The pthread_rwlockattr_getpshared() function first appeared in FreeBSD 3.0. BSD March 22, 1999 BSD
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