pthread_condattr_init()--Initialize Condition Variable Attributes Object
Syntax:
#include <pthread.h> int pthread_condattr_init(pthread_condattr_t *attr);Service Program Name: QP0WPTHR
Default Public Authority: *USE
Threadsafe: Yes
Signal Safe: Yes
The pthread_condattr_init() function initializes the condition variable attributes object specified by attr to the default attributes. The condition variable attributes object is used to create condition variables with the pthread_cond_init() function.
Authorities and Locks
None.
Parameters
- attr
- (Output) The address of the variable to contain the condition variable attributes object
Return Value
- 0
- pthread_condattr_init() was successful.
- value
- pthread_condattr_init() was not successful. value is set to indicate the error condition.
Error Conditions
If pthread_condattr_init() was not successful, the error condition returned usually indicates one of the following errors. Under some conditions, the value returned could indicate an error other than those listed here.
- [EINVAL]
-
The value specified for the argument is not correct.
Related Information
- The <pthread.h> header file. See Header files for Pthread functions.
- pthread_condattr_destroy()--Destroy Condition
Variable Attributes Object
- pthread_cond_init()--Initialize Condition Variable
Example
Note: By using the code examples, you agree to the terms of the Code license and disclaimer information.
#include <pthread.h> #include <stdio.h> #include "check.h" pthread_cond_t cond; int main(int argc, char **argv) { int rc=0; pthread_condattr_t attr; printf("Entering testcase\n"); printf("Create a default condition attribute\n"); rc = pthread_condattr_init(&attr); checkResults("pthread_condattr_init\n", rc); printf("Create the condition using the condition attributes object\n"); rc = pthread_cond_init(&cond, &attr); checkResults("pthread_cond_init()\n", rc); printf("- At this point, the condition with its default attributes\n"); printf("- Can be used from any threads that want to use it\n"); printf("Destroy cond attribute\n"); rc = pthread_condattr_destroy(&attr); checkResults("pthread_condattr_destroy()\n", rc); printf("Destroy condition\n"); rc = pthread_cond_destroy(&cond); checkResults("pthread_cond_destroy()\n", rc); printf("Main completed\n"); return 0; }
Output:
Entering testcase Create a default condition attribute Create the condition using the condition attributes object - At this point, the condition with its default attributes - Can be used from any threads that want to use it Destroy cond attribute Destroy condition Main completed
API introduced: V4R3
[ Back to top | Pthread APIs | APIs by category ]