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Langue: en

Version: 2008-11-11 (fedora - 01/12/10)

Section: 3 (Bibliothèques de fonctions)


pthread_attr_init, pthread_attr_destroy - initialize and destroy thread attributes object


 #include <pthread.h>
 int pthread_attr_init(pthread_attr_t *attr);
 int pthread_attr_destroy(pthread_attr_t *attr);
 Compile and link with -pthread.


The pthread_attr_init() function initializes the thread attributes object pointed to by attr with default attribute values. After this call, individual attributes of the object can be set using various related functions (listed under SEE ALSO), and then the object can be used in one or more pthread_create(3) calls that create threads.

Calling pthread_attr_init() on a thread attributes object that has already been initialized results in undefined behavior.

When a thread attributes object is no longer required, it should be destroyed using the pthread_attr_destroy() function. Destroying a thread attributes object has no effect on threads that were created using that object.

Once a thread attributes object has been destroyed, it can be reinitialized using pthread_attr_init(). Any other use of a destroyed thread attributes object has undefined results.


On success, these functions return 0; on error, they return a nonzero error number.


POSIX.1-2001 documents an ENOMEM error for pthread_attr_init(); on Linux these functions always succeed (but portable and future-proof applications should nevertheless handle a possible error return).




The pthread_attr_t type should be treated as opaque: any access to the object other than via pthreads functions is nonportable and produces undefined results.


The program below optionally makes use of pthread_attr_init() and various related functions to initialize a thread attributes object that is used to create a single thread. Once created, the thread uses the pthread_getattr_np() function (a nonstandard GNU extension) to retrieve the thread's attributes, and then displays those attributes.

If the program is run with no command-line argument, then it passes NULL as the attr argument of pthread_create(3), so that the thread is created with default attributes. Running the program on Linux/x86-32 with the NPTL threading implementation, we see the following:

 $ ulimit -s       # No stack imit ==> default stack size is 2MB
 $ ./a.out
 Thread attributes:
         Detach state        = PTHREAD_CREATE_JOINABLE
         Scope               = PTHREAD_SCOPE_SYSTEM
         Inherit scheduler   = PTHREAD_INHERIT_SCHED
         Scheduling policy   = SCHED_OTHER
         Scheduling priority = 0
         Guard size          = 4096 bytes
         Stack address       = 0x40196000
         Stack size          = 0x201000 bytes

When we supply a stack size as a command-line argument, the program initializes a thread attributes object, sets various attributes in that object, and passes a pointer to the object in the call to pthread_create(3). Running the program on Linux/x86-32 with the NPTL threading implementation, we see the following:

 $ ./a.out 0x3000000
 posix_memalign() allocated at 0x40197000
 Thread attributes:
         Detach state        = PTHREAD_CREATE_DETACHED
         Scope               = PTHREAD_SCOPE_SYSTEM
         Inherit scheduler   = PTHREAD_EXPLICIT_SCHED
         Scheduling policy   = SCHED_OTHER
         Scheduling priority = 0
         Guard size          = 0 bytes
         Stack address       = 0x40197000
         Stack size          = 0x3000000 bytes

Program source

 #define _GNU_SOURCE     /* To get pthread_getattr_np() declaration */
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <errno.h>
 #define handle_error_en(en, msg) \
         do { errno = en; perror(msg); exit(EXIT_FAILURE); } while (0)
 static void
 display_pthread_attr(pthread_attr_t *attr, char *prefix)
     int s, i;
     size_t v;
     void *stkaddr;
     struct sched_param sp;
     s = pthread_attr_getdetachstate(attr, &i);
     if (s != 0)
         handle_error_en(s, "pthread_attr_getdetachstate");
     printf("%sDetach state        = %s\n", prefix,
     s = pthread_attr_getscope(attr, &i);
     if (s != 0)
         handle_error_en(s, "pthread_attr_getscope");
     printf("%sScope               = %s\n", prefix,
     s = pthread_attr_getinheritsched(attr, &i);
     if (s != 0)
         handle_error_en(s, "pthread_attr_getinheritsched");
     printf("%sInherit scheduler   = %s\n", prefix,
     s = pthread_attr_getschedpolicy(attr, &i);
     if (s != 0)
         handle_error_en(s, "pthread_attr_getschedpolicy");
     printf("%sScheduling policy   = %s\n", prefix,
             (i == SCHED_OTHER) ? "SCHED_OTHER" :
             (i == SCHED_FIFO)  ? "SCHED_FIFO" :
             (i == SCHED_RR)    ? "SCHED_RR" :
     s = pthread_attr_getschedparam(attr, &sp);
     if (s != 0)
         handle_error_en(s, "pthread_attr_getschedparam");
     printf("%sScheduling priority = %d\n", prefix, sp.sched_priority);
     s = pthread_attr_getguardsize(attr, &v);
     if (s != 0)
         handle_error_en(s, "pthread_attr_getguardsize");
     printf("%sGuard size          = %d bytes\n", prefix, v);
     s = pthread_attr_getstack(attr, &stkaddr, &v);
     if (s != 0)
         handle_error_en(s, "pthread_attr_getstack");
     printf("%sStack address       = %p\n", prefix, stkaddr);
     printf("%sStack size          = 0x%x bytes\n", prefix, v);
 static void *
 thread_start(void *arg)
     int s;
     pthread_attr_t gattr;
     /* pthread_getattr_np() is a non-standard GNU extension that
        retrieves the attributes of the thread specified in its
        first argument */
     s = pthread_getattr_np(pthread_self(), &gattr);
     if (s != 0)
         handle_error_en(s, "pthread_getattr_np");
     printf("Thread attributes:\n");
     display_pthread_attr(&gattr, "\t");
     exit(EXIT_SUCCESS);         /* Terminate all threads */
 main(int argc, char *argv[])
     pthread_t thr;
     pthread_attr_t attr;
     pthread_attr_t *attrp;      /* NULL or &attr */
     int s;
     attrp = NULL;
     /* If a command-line argument was supplied, use it to set the
        stack-size attribute and set a few other thread attributes,
        and set attrp pointing to thread attributes object */
     if (argc > 1) {
         int stack_size;
         void *sp;
         attrp = &attr;
         s = pthread_attr_init(&attr);
         if (s != 0)
             handle_error_en(s, "pthread_attr_init");
         s = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
         if (s != 0)
             handle_error_en(s, "pthread_attr_setdetachstate");
         s = pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED);
         if (s != 0)
             handle_error_en(s, "pthread_attr_setinheritsched");
         stack_size = strtoul(argv[1], NULL, 0);
         s = posix_memalign(&sp, sysconf(_SC_PAGESIZE), stack_size);
         if (s != 0)
             handle_error_en(s, "posix_memalign");
         printf("posix_memalign() allocated at %p\n", sp);
         s = pthread_attr_setstack(&attr, sp, stack_size);
         if (s != 0)
             handle_error_en(s, "pthread_attr_setstack");
     s = pthread_create(&thr, attrp, &thread_start, NULL);
     if (s != 0)
         handle_error_en(s, "pthread_create");
     if (attrp != NULL) {
         s = pthread_attr_destroy(attrp);
         if (s != 0)
             handle_error_en(s, "pthread_attr_destroy");
     pause();    /* Terminates when other thread calls exit() */


pthread_attr_setaffinity_np(3), pthread_attr_setdetachstate(3), pthread_attr_setguardsize(3), pthread_attr_setinheritsched(3), pthread_attr_setschedparam(3), pthread_attr_setschedpolicy(3), pthread_attr_setscope(3), pthread_attr_setstack(3), pthread_attr_setstackaddr(3), pthread_attr_setstacksize(3), pthread_create(3), pthread_getattr_np(3), pthreads(7)


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