NAME

pthread.h - threads

SYNOPSIS

^[THR] #include <pthread.h>

DESCRIPTION

The <pthread.h> header shall define the following symbols:

^[BAR]
PTHREAD_BARRIER_SERIAL_THREAD

PTHREAD_CANCEL_ASYNCHRONOUS
PTHREAD_CANCEL_ENABLE
PTHREAD_CANCEL_DEFERRED
PTHREAD_CANCEL_DISABLE
PTHREAD_CANCELED
PTHREAD_COND_INITIALIZER
PTHREAD_CREATE_DETACHED
PTHREAD_CREATE_JOINABLE
PTHREAD_EXPLICIT_SCHED
PTHREAD_INHERIT_SCHED
^[XSI]
PTHREAD_MUTEX_DEFAULT
PTHREAD_MUTEX_ERRORCHECK

PTHREAD_MUTEX_INITIALIZER
^[XSI]
PTHREAD_MUTEX_NORMAL
PTHREAD_MUTEX_RECURSIVE

PTHREAD_ONCE_INIT
^[TPI]
PTHREAD_PRIO_INHERIT

^[TPP|TPI]
PTHREAD_PRIO_NONE

^[TPP]
PTHREAD_PRIO_PROTECT

PTHREAD_PROCESS_SHARED
PTHREAD_PROCESS_PRIVATE
^[TPS]
PTHREAD_SCOPE_PROCESS
PTHREAD_SCOPE_SYSTEM

The following types shall be defined as described in <sys/types.h> :

pthread_attr_t
^[BAR]
pthread_barrier_t
pthread_barrierattr_t

pthread_cond_t
pthread_condattr_t
pthread_key_t
pthread_mutex_t
pthread_mutexattr_t
pthread_once_t
pthread_rwlock_t
pthread_rwlockattr_t
^[SPI]
pthread_spinlock_t

pthread_t

The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.

int   pthread_atfork(void (*)(void), void (*)(void),
          void(*)(void));
int   pthread_attr_destroy(pthread_attr_t *);
int   pthread_attr_getdetachstate(const pthread_attr_t *, int *);
[XSI]
int   pthread_attr_getguardsize(const pthread_attr_t *restrict,
          size_t *restrict);

[TPS]
int   pthread_attr_getinheritsched(const pthread_attr_t *restrict,
          int *restrict);

int   pthread_attr_getschedparam(const pthread_attr_t *restrict,
          struct sched_param *restrict);
[TPS]
int   pthread_attr_getschedpolicy(const pthread_attr_t *restrict,
          int *restrict);

[TPS]
int   pthread_attr_getscope(const pthread_attr_t *restrict,
          int *restrict);

[TSA TSS]
int   pthread_attr_getstack(const pthread_attr_t *restrict,
          void **restrict, size_t *restrict);

[TSA]
int   pthread_attr_getstackaddr(const pthread_attr_t *restrict,
          void **restrict);

[TSS]
int   pthread_attr_getstacksize(const pthread_attr_t *restrict,
          size_t *restrict);

int   pthread_attr_init(pthread_attr_t *);
int   pthread_attr_setdetachstate(pthread_attr_t *, int);
[XSI]
int   pthread_attr_setguardsize(pthread_attr_t *, size_t);

[TPS]
int   pthread_attr_setinheritsched(pthread_attr_t *, int);

int   pthread_attr_setschedparam(pthread_attr_t *restrict,
          const struct sched_param *restrict);
[TPS]
int   pthread_attr_setschedpolicy(pthread_attr_t *, int);
int   pthread_attr_setscope(pthread_attr_t *, int);

[TSA TSS]
int   pthread_attr_setstack(pthread_attr_t *, void *, size_t);

[TSA]
int   pthread_attr_setstackaddr(pthread_attr_t *, void *);

[TSS]
int   pthread_attr_setstacksize(pthread_attr_t *, size_t);

[BAR]
int   pthread_barrier_destroy(pthread_barrier_t *);
int   pthread_barrier_init(pthread_barrier_t *restrict,
          const pthread_barrierattr_t *restrict, unsigned);
int   pthread_barrier_wait(pthread_barrier_t *);
int   pthread_barrierattr_destroy(pthread_barrierattr_t *);

[BAR TSH]
int   pthread_barrierattr_getpshared(
          const pthread_barrierattr_t *restrict, int *restrict);

[BAR]
int   pthread_barrierattr_init(pthread_barrierattr_t *);

[BAR TSH]
int   pthread_barrierattr_setpshared(pthread_barrierattr_t *, int);

int   pthread_cancel(pthread_t);
void  pthread_cleanup_push(void (*)(void *), void *);
void  pthread_cleanup_pop(int);
int   pthread_cond_broadcast(pthread_cond_t *);
int   pthread_cond_destroy(pthread_cond_t *);
int   pthread_cond_init(pthread_cond_t *restrict,
          const pthread_condattr_t *restrict);
int   pthread_cond_signal(pthread_cond_t *);
int   pthread_cond_timedwait(pthread_cond_t *restrict,
          pthread_mutex_t *restrict, const struct timespec *restrict);
int   pthread_cond_wait(pthread_cond_t *restrict,
          pthread_mutex_t *restrict);
int   pthread_condattr_destroy(pthread_condattr_t *);
[CS]
int   pthread_condattr_getclock(const pthread_condattr_t *restrict,
          clockid_t *restrict);

[TSH]
int   pthread_condattr_getpshared(const pthread_condattr_t *restrict,
          int *restrict);

int   pthread_condattr_init(pthread_condattr_t *);
[CS]
int   pthread_condattr_setclock(pthread_condattr_t *, clockid_t);

[TSH]
int   pthread_condattr_setpshared(pthread_condattr_t *, int);

int   pthread_create(pthread_t *restrict, const pthread_attr_t *restrict,
          void *(*)(void *), void *restrict);
int   pthread_detach(pthread_t);
int   pthread_equal(pthread_t, pthread_t);
void  pthread_exit(void *);
[XSI]
int   pthread_getconcurrency(void);

[TCT]
int   pthread_getcpuclockid(pthread_t, clockid_t *);

[TPS]
int   pthread_getschedparam(pthread_t, int *restrict,
          struct sched_param *restrict);

void *pthread_getspecific(pthread_key_t);
int   pthread_join(pthread_t, void **);
int   pthread_key_create(pthread_key_t *, void (*)(void *));
int   pthread_key_delete(pthread_key_t);
int   pthread_mutex_destroy(pthread_mutex_t *);
[TPP]
int   pthread_mutex_getprioceiling(const pthread_mutex_t *restrict,
          int *restrict);

int   pthread_mutex_init(pthread_mutex_t *restrict,
          const pthread_mutexattr_t *restrict);
int   pthread_mutex_lock(pthread_mutex_t *);
[TPP]
int   pthread_mutex_setprioceiling(pthread_mutex_t *restrict, int,
          int *restrict);

[TMO]
int   pthread_mutex_timedlock(pthread_mutex_t *,
          const struct timespec *);

int   pthread_mutex_trylock(pthread_mutex_t *);
int   pthread_mutex_unlock(pthread_mutex_t *);
int   pthread_mutexattr_destroy(pthread_mutexattr_t *);
[TPP]
int   pthread_mutexattr_getprioceiling(
          const pthread_mutexattr_t *restrict, int *restrict);

[TPP|TPI]
int   pthread_mutexattr_getprotocol(const pthread_mutexattr_t *restrict,
          int *restrict);

[TSH]
int   pthread_mutexattr_getpshared(const pthread_mutexattr_t *restrict,
          int *restrict);

[XSI]
int   pthread_mutexattr_gettype(const pthread_mutexattr_t *restrict,
          int *restrict);

int   pthread_mutexattr_init(pthread_mutexattr_t *);
[TPP]
int   pthread_mutexattr_setprioceiling(pthread_mutexattr_t *, int);

[TPP|TPI]
int   pthread_mutexattr_setprotocol(pthread_mutexattr_t *, int);

[TSH]
int   pthread_mutexattr_setpshared(pthread_mutexattr_t *, int);

[XSI]
int   pthread_mutexattr_settype(pthread_mutexattr_t *, int);

int   pthread_once(pthread_once_t *, void (*)(void));
int   pthread_rwlock_destroy(pthread_rwlock_t *);
int   pthread_rwlock_init(pthread_rwlock_t *restrict,
          const pthread_rwlockattr_t *restrict);
int   pthread_rwlock_rdlock(pthread_rwlock_t *);
[TMO]
int   pthread_rwlock_timedrdlock(pthread_rwlock_t *restrict,
          const struct timespec *restrict);
int   pthread_rwlock_timedwrlock(pthread_rwlock_t *restrict,
          const struct timespec *restrict);

int   pthread_rwlock_tryrdlock(pthread_rwlock_t *);
int   pthread_rwlock_trywrlock(pthread_rwlock_t *);
int   pthread_rwlock_unlock(pthread_rwlock_t *);
int   pthread_rwlock_wrlock(pthread_rwlock_t *);
int   pthread_rwlockattr_destroy(pthread_rwlockattr_t *);
[TSH]
int   pthread_rwlockattr_getpshared(
          const pthread_rwlockattr_t *restrict, int *restrict);

int   pthread_rwlockattr_init(pthread_rwlockattr_t *);
[TSH]
int   pthread_rwlockattr_setpshared(pthread_rwlockattr_t *, int);

pthread_t
      pthread_self(void);
int   pthread_setcancelstate(int, int *);
int   pthread_setcanceltype(int, int *);
[XSI]
int   pthread_setconcurrency(int);

[TPS]
int   pthread_setschedparam(pthread_t, int,
          const struct sched_param *);

[TPS]
int   pthread_setschedprio(pthread_t, int);

int   pthread_setspecific(pthread_key_t, const void *);
[SPI]
int   pthread_spin_destroy(pthread_spinlock_t *);
int   pthread_spin_init(pthread_spinlock_t *, int);
int   pthread_spin_lock(pthread_spinlock_t *);
int   pthread_spin_trylock(pthread_spinlock_t *);
int   pthread_spin_unlock(pthread_spinlock_t *);

void  pthread_testcancel(void);

Inclusion of the <pthread.h> header shall make symbols defined in the headers <sched.h> and <time.h> visible.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

<sched.h>, <sys/types.h>, <time.h>, the System Interfaces volume of IEEE Std 1003.1-2001, pthread_attr_getguardsize(), pthread_attr_init(), pthread_attr_setscope(), pthread_barrier_destroy(), pthread_barrier_init(), pthread_barrier_wait(), pthread_barrierattr_destroy(), pthread_barrierattr_getpshared(), pthread_barrierattr_init(), pthread_barrierattr_setpshared(), pthread_cancel(), pthread_cleanup_pop(), pthread_cond_init(), pthread_cond_signal(), pthread_cond_wait(), pthread_condattr_getclock(), pthread_condattr_init(), pthread_condattr_setclock(), pthread_create(), pthread_detach(), pthread_equal(), pthread_exit(), pthread_getconcurrency(), pthread_getcpuclockid(), pthread_getschedparam(), pthread_join(), pthread_key_create(), pthread_key_delete(), pthread_mutex_init(), pthread_mutex_lock(), pthread_mutex_setprioceiling(), pthread_mutex_timedlock(), pthread_mutexattr_init(), pthread_mutexattr_gettype(), pthread_mutexattr_setprotocol(), pthread_once(), pthread_rwlock_destroy(), pthread_rwlock_init(), pthread_rwlock_rdlock(), pthread_rwlock_timedrdlock(), pthread_rwlock_timedwrlock(), pthread_rwlock_tryrdlock(), pthread_rwlock_trywrlock(), pthread_rwlock_unlock(), pthread_rwlock_wrlock(), pthread_rwlockattr_destroy(), pthread_rwlockattr_getpshared(), pthread_rwlockattr_init(), pthread_rwlockattr_setpshared(), pthread_self(), pthread_setcancelstate(), pthread_setspecific(), pthread_spin_destroy(), pthread_spin_init(), pthread_spin_lock(), pthread_spin_trylock(), pthread_spin_unlock()

CHANGE HISTORY

First released in Issue 5. Included for alignment with the POSIX Threads Extension.

Issue 6

The RTT margin markers are broken out into their POSIX options.

The Open Group Corrigendum U021/9 is applied, correcting the prototype for the pthread_cond_wait() function.

The Open Group Corrigendum U026/2 is applied, correcting the prototype for the pthread_setschedparam() function so that its second argument is of type int.

The pthread_getcpuclockid() and pthread_mutex_timedlock() functions are added for alignment with IEEE Std 1003.1d-1999.

The following functions are added for alignment with IEEE Std 1003.1j-2000: pthread_barrier_destroy(), pthread_barrier_init(), pthread_barrier_wait(), pthread_barrierattr_destroy(), pthread_barrierattr_getpshared(), pthread_barrierattr_init(), pthread_barrierattr_setpshared(), pthread_condattr_getclock(), pthread_condattr_setclock(), pthread_rwlock_timedrdlock(), pthread_rwlock_timedwrlock(), pthread_spin_destroy(), pthread_spin_init(), pthread_spin_lock(), pthread_spin_trylock(), and pthread_spin_unlock().

PTHREAD_RWLOCK_INITIALIZER is deleted for alignment with IEEE Std 1003.1j-2000.

Functions previously marked as part of the Read-Write Locks option are now moved to the Threads option.

The restrict keyword is added to the prototypes for pthread_attr_getguardsize(), pthread_attr_getinheritsched(), pthread_attr_getschedparam(), pthread_attr_getschedpolicy(), pthread_attr_getscope(), pthread_attr_getstackaddr(), pthread_attr_getstacksize(), pthread_attr_setschedparam(), pthread_barrier_init(), pthread_barrierattr_getpshared(), pthread_cond_init(), pthread_cond_signal(), pthread_cond_timedwait(), pthread_cond_wait(), pthread_condattr_getclock(), pthread_condattr_getpshared(), pthread_create(), pthread_getschedparam(), pthread_mutex_getprioceiling(), pthread_mutex_init(), pthread_mutex_setprioceiling(), pthread_mutexattr_getprioceiling(), pthread_mutexattr_getprotocol(), pthread_mutexattr_getpshared(), pthread_mutexattr_gettype(), pthread_rwlock_init(), pthread_rwlock_timedrdlock(), pthread_rwlock_timedwrlock(), pthread_rwlockattr_getpshared(), and pthread_sigmask().

IEEE PASC Interpretation 1003.1 #86 is applied, allowing the symbols from <sched.h> and <time.h> to be made visible when <pthread.h> is included. Previously this was an XSI extension.

IEEE PASC Interpretation 1003.1c #42 is applied, removing the requirement for prototypes for the pthread_kill() and pthread_sigmask() functions. These are required to be in the <signal.h> header. They are allowed here through the name space rules.

IEEE PASC Interpretation 1003.1 #96 is applied, adding the pthread_setschedprio() function.

IEEE Std 1003.1-2001/Cor 1-2002, item XBD/TC1/D6/13 is applied, correcting shading errors that were in contradiction with the System Interfaces volume of IEEE Std 1003.1-2001.