pthread_attr_init()--Initialize Thread Attributes Object
Syntax:
#include <pthread.h> int pthread_attr_init(pthread_attr_t *attr);Service Program Name: QP0WPTHR
Default Public Authority: *USE
Threadsafe: Yes
Signal Safe: Yes
The pthread_attr_init() function initializes a thread attributes object to the default thread attributes. The thread attributes object can be used in a call to pthread_create() to specify attributes of the new thread.
Authorities and Locks
None.
Parameters
- attr
- (Input/Output) The address of the thread attributes object to be initialized
Return Value
- 0
- pthread_attr_init() was successful.
- value
- pthread_attr_init() was not successful. value is set to indicate the error condition.
Error Conditions
If pthread_attr_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_attr_destroy()--Destroy Thread Attributes
Object
- pthread_create()--Create Thread
Example
Note: By using the code examples, you agree to the terms of the Code license and disclaimer information.
#define _MULTI_THREADED #include <pthread.h> #include <stdio.h> #include "check.h" void *threadfunc(void *parm) { printf("Thread created using an default attributes\n"); return NULL; } int main(int argc, char **argv) { pthread_t thread; int rc=0; pthread_attr_t pta; printf("Enter Testcase - %s\n", argv[0]); printf("Create a thread attributes object\n"); rc = pthread_attr_init(&pta); checkResults("pthread_attr_init()\n", rc); printf("Create a thread using the attributes object\n"); rc = pthread_create(&thread, &pta, threadfunc, NULL); checkResults("pthread_create()\n", rc); printf("Create a thread using the default attributes\n"); rc = pthread_create(&thread, NULL, threadfunc, NULL); checkResults("pthread_create()\n", rc); printf("Destroy thread attributes object\n"); rc = pthread_attr_destroy(&pta); checkResults("pthread_attr_destroy()\n", rc); /* sleep() is not a very robust way to wait for the thread */ sleep(5); printf("Main completed\n"); return 0; }
Output:
Enter Testcase - QP0WTEST/TAINI0 Create a thread attributes object Create a thread using the attributes object Create a thread using the default attributes Destroy thread attributes object Thread created using an default attributes Thread created using an default attributes Main completed
API introduced: V4R3
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