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tis_mutex_init(3) [osf1 man page]

tis_mutex_init(3)					     Library Functions Manual						 tis_mutex_init(3)

NAME
tis_mutex_init - Initializes a mutex object. LIBRARY
Standard C Library (libc.so, libc.a) SYNOPSIS
#include <tis.h> int tis_mutex_init( pthread_mutex_t *mutex); STANDARDS
None PARAMETERS
Pointer to a mutex object (passed by reference) to be initialized. DESCRIPTION
This routine initializes a mutex object with the DECthreads default mutex attributes. A mutex is a synchronization object that allows mul- tiple threads to serialize their access to shared data. The mutex is initialized and set to an unlocked state. Your program can use the PTHREAD_MUTEX_INITIALIZER macro to statically initialize a mutex object without calling this routine. Static ini- tialization can be used only for a condition variable with class extern or static - automatic (stack local) objects must be initialized by calling tis_mutex_init(3). Use this macro as follows: pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER RETURN VALUES
If an error condition occurs, this routine returns an integer value indicating the type of error, the mutex is not initialized, and the contents of mutex are undefined. Possible return values are as follows: Successful completion. The system lacks the necessary resources to initialize a mutex. The implementation has detected an attempt to reinitialize mutex (a previously initialized, but not yet destroyed mutex). The value specified by mutex is not a valid mutex. Insufficient memory exists to initialize the mutex. The caller does not have privileges to perform this operation. ERRORS
None RELATED INFORMATION
Functions: tis_mutex_destroy(3), tis_mutex_lock(3), tis_mutex_trylock(3), tis_mutex_unlock(3) Manuals: Guide to DECthreads and Programmer's Guide delim off tis_mutex_init(3)

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pthread_mutexattr_setpshared(3) 			     Library Functions Manual				   pthread_mutexattr_setpshared(3)

NAME
pthread_mutexattr_setpshared - Sets the process-shared attribute of a mutex attributes object. LIBRARY
DECthreads POSIX 1003.1c Library (libpthread.so) SYNOPSIS
#include <pthread.h> int pthread_mutexattr_setpshared( pthread_mutexattr_t *attr, int pshared); PARAMETERS
Address of the mutex attributes object whose process-shared attribute is to be set. Value to set in the process-shared attribute of attr. Must be the value PTHREAD_PROCESS_SHARED, to permit access to the mutex in by any thread in any process that can access the memory where the mutex object is allocated, or PTHREAD_PROCESS_PRIVATE, to permit access to the mutex only by threads in the same process as the thread that initialized the mutex object. DESCRIPTION
This routine uses the value in pshared to set the process-shared attribute in the mutex attributes object referenced by attr. The object referenced by attr must be initialized before this routine is called. The value of pshared must be either PTHREAD_PROCESS_SHARED or PTHREAD_PROCESS_PRIVATE, as defined in the pthread.h include file. Setting the process-shared attribute to PTHREAD_PROCESS_PRIVATE permits a mutex to be operated upon by threads created within the same process as the thread that initialized the mutex. If threads of differing processes attempt to operate on such a mutex, the behavior is undefined. The default value of the process-shared attribute of a mutex attributes object is PTHREAD_PROCESS_PRIVATE. Setting the process-shared attribute to PTHREAD_PROCESS_SHARED permits a mutex to be operated upon by any thread that has access to the memory where the mutex is allocated, even if the mutex is allocated in memory that is shared by multiple processes. RETURN VALUES
If an error condition occurs, this routine returns an integer value indicating the type of error. Possible return values are as follows: Successful completion. The value specified by attr is not a valid mutex attributes object, or the new value specified for the attribute is outside the range of legal values for that attribute. ERRORS
None RELATED INFORMATION
Functions: pthread_mutexattr_getpshared(3), pthread_mutexattr_init(3) Manuals: Guide to DECthreads and Programmer's Guide delim off pthread_mutexattr_setpshared(3)
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