pthread_condattr_setpshared(3c) [opensolaris man page]
pthread_condattr_getpshared(3C) Standard C Library Functions pthread_condattr_getpshared(3C) NAME
pthread_condattr_getpshared, pthread_condattr_setpshared - get or set process-shared condition variable attributes SYNOPSIS
cc -mt [ flag... ] file... -lpthread [ library... ] #include <pthread.h> int pthread_condattr_getpshared( const pthread_condattr_t *restrict attr, int *restrict pshared); int pthread_condattr_setpshared(pthread_condattr_t *attr, int pshared); DESCRIPTION
The pthread_condattr_getpshared() function obtains the value of the process-shared attribute from the attributes object referenced by attr. The pthread_condattr_setpshared() function is used to set the process-shared attribute in an initialized attributes object referenced by attr. The process-shared attribute is set to PTHREAD_PROCESS_SHARED to permit a condition variable to be operated upon by any thread that has access to the memory where the condition variable is allocated, even if the condition variable is allocated in memory that is shared by multiple processes. If the process-shared attribute is PTHREAD_PROCESS_PRIVATE, the condition variable will only be operated upon by threads created within the same process as the thread that initialized the condition variable; if threads of differing processes attempt to operate on such a condition variable, the behavior is undefined. The default value of the attribute is PTHREAD_PROCESS_PRIVATE. Additional attributes, their default values, and the names of the associated functions to get and set those attribute values are implemen- tation-dependent. RETURN VALUES
If successful, the pthread_condattr_setpshared() function returns 0. Otherwise, an error number is returned to indicate the error. If successful, the pthread_condattr_getpshared() function returns 0 and stores the value of the process-shared attribute of attr into the object referenced by the pshared parameter. Otherwise, an error number is returned to indicate the error. ERRORS
The pthread_condattr_getpshared() and pthread_condattr_setpshared() functions may fail if: EINVAL The value specified by attr is invalid. The pthread_condattr_setpshared() function will fail if: EINVAL The new value specified for the attribute is outside the range of legal values for that attribute. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
pthread_condattr_init(3C), pthread_create(3C), pthread_mutex_init(3C), pthread_cond_init(3C), attributes(5), standards(5) SunOS 5.11 23 Mar 2005 pthread_condattr_getpshared(3C)
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pthread_condattr_getpshared(3T) pthread_condattr_getpshared(3T) NAME
pthread_condattr_getpshared(), pthread_condattr_setpshared() - get or set the process-shared attribute SYNOPSIS
PARAMETERS
attr Pointer to the condition variable attributes object whose process-shared attribute is to be set/retrieved. pshared This parameter either specifies the new value of the process-shared attribute (set function) or it points to the memory location where the process-shared attribute of attr is to be returned (get function). DESCRIPTION
The attributes object attr must have been previously initialized with the function before these functions are called. The functions are used to set and retrieve the process-shared attribute in a condition variable attributes object. The legal values for the process-shared attribute are: This option permits a condition variable to be operated upon by any thread that has access to the memory where the condition variable is allocated. The application is responsible for allocating the condition variable in memory that multiple processes can access. The condition variable can be operated on only by threads created within the same process as the thread that initialized the condition variable. If threads of differing processes attempt to operate on such condition variable, the behavior is undefined. The default value of process-shared is sets the process-shared attribute in attr. The new value of the process-shared attribute of attr is set to the value specified in the pshared parameter. retrieves the value of the process-shared attribute from attr. The value of the process-shared attribute of attr is returned in the pshared parameter. RETURN VALUE
Upon successful completion, and return zero. Otherwise, an error number is returned to indicate the error (the variable is not set). ERRORS
If any of the following occur, the and functions return the corresponding error number: is not defined and these functions are not supported. For each of the following conditions, if the condition is detected, the function returns the corresponding error number: attr is not a valid condition variable attributes object. The value specified by pshared is not a legal value. For each of the following conditions, if the condition is detected, the function returns the corresponding error number: The value specified by attr or pshared is invalid. WARNINGS
If a condition variable is created with the process-shared attribute defined as the cooperating processes should have access to the memory in which the condition variable is allocated. AUTHOR
and were derived from the IEEE POSIX P1003.1c standard. SEE ALSO
pthread_create(3T), pthread_condattr_init(3T), pthread_cond_init(3T), pthread_mutex_init(3T). STANDARDS CONFORMANCE
Pthread Library pthread_condattr_getpshared(3T)