pthread.h(0P)

📦 version 2017a, in alpine 3.22, alpine 3.23, alpine 3.24, arch rolling, nixpkgs unstable, opensuse-leap 16.0

💖 pthread.h(0P) — POSIX Programmer's Manual 💖

okay bestie, welcome to the POSIX Programmer's Manual glow-up of pthread.h(0P). this is part 1 of 2, and it's giving threads, threads, threads ✨

🫧 PROLOG 🫧

This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for the deets on Linux behavior), or the interface may not be implemented on Linux. no cap, so check your local Linux tea before you spiral. 💅

🌸 NAME 🌸

pthread.h — threads. it's literally the header for thread vibes. 🧵✨

✨ SYNOPSIS ✨

#include <pthread.h>

👑 DESCRIPTION 👑

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

PTHREAD_BARRIER_SERIAL_THREAD
PTHREAD_CANCEL_ASYNCHRONOUS
PTHREAD_CANCEL_ENABLE
PTHREAD_CANCEL_DEFERRED
PTHREAD_CANCEL_DISABLE
PTHREAD_CANCELED
PTHREAD_CREATE_DETACHED
PTHREAD_CREATE_JOINABLE
PTHREAD_EXPLICIT_SCHED
PTHREAD_INHERIT_SCHED
PTHREAD_MUTEX_DEFAULT
PTHREAD_MUTEX_ERRORCHECK
PTHREAD_MUTEX_NORMAL
PTHREAD_MUTEX_RECURSIVE
PTHREAD_MUTEX_ROBUST
PTHREAD_MUTEX_STALLED
PTHREAD_ONCE_INIT
PTHREAD_PRIO_INHERIT
PTHREAD_PRIO_NONE
PTHREAD_PRIO_PROTECT
PTHREAD_PROCESS_SHARED
PTHREAD_PROCESS_PRIVATE
PTHREAD_SCOPE_PROCESS
PTHREAD_SCOPE_SYSTEM

The <pthread.h> header shall define the following compile-time constant expressions valid as initializers for the following types:

PTHREAD_COND_INITIALIZER — initializer for type pthread_cond_t
PTHREAD_MUTEX_INITIALIZER — initializer for type pthread_mutex_t
PTHREAD_RWLOCK_INITIALIZER — initializer for type pthread_rwlock_t

The <pthread.h> header shall define the pthread_attr_t, 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, pthread_spinlock_t, and pthread_t types as described in <sys/types.h>. all the type besties, periodt. 💖

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 *);
           int   pthread_attr_getguardsize(const pthread_attr_t *restrict,
                     size_t *restrict);
           int   pthread_attr_getinheritsched(const pthread_attr_t *restrict,
                     int *restrict);
           int   pthread_attr_getschedparam(const pthread_attr_t *restrict,
                     struct sched_param *restrict);
           int   pthread_attr_getschedpolicy(const pthread_attr_t *restrict,
                     int *restrict);
           int   pthread_attr_getscope(const pthread_attr_t *restrict,
                     int *restrict);
           int   pthread_attr_getstack(const pthread_attr_t *restrict,
                     void **restrict, size_t *restrict);
           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);
           int   pthread_attr_setguardsize(pthread_attr_t *, size_t);
           int   pthread_attr_setinheritsched(pthread_attr_t *, int);
           int   pthread_attr_setschedparam(pthread_attr_t *restrict,
                     const struct sched_param *restrict);
           int   pthread_attr_setschedpolicy(pthread_attr_t *, int);
           int   pthread_attr_setscope(pthread_attr_t *, int);
           int   pthread_attr_setstack(pthread_attr_t *, void *, size_t);
           int   pthread_attr_setstacksize(pthread_attr_t *, size_t);
           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 *);
           int   pthread_barrierattr_getpshared(
                     const pthread_barrierattr_t *restrict, int *restrict);
           int   pthread_barrierattr_init(pthread_barrierattr_t *);
           int   pthread_barrierattr_setpshared(pthread_barrierattr_t *, int);
           int   pthread_cancel(pthread_t);
           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 *);
           int   pthread_condattr_getclock(const pthread_condattr_t *restrict,
                     clockid_t *restrict);
           int   pthread_condattr_getpshared(const pthread_condattr_t *restrict,
                     int *restrict);
           int   pthread_condattr_init(pthread_condattr_t *);
           int   pthread_condattr_setclock(pthread_condattr_t *, clockid_t);
           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 *);
           int   pthread_getconcurrency(void);
           int   pthread_getcpuclockid(pthread_t, clockid_t *);
           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_consistent(pthread_mutex_t *);
           int   pthread_mutex_destroy(pthread_mutex_t *);
           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 *);
           int   pthread_mutex_setprioceiling(pthread_mutex_t *restrict, int,
                     int *restrict);
           int   pthread_mutex_timedlock(pthread_mutex_t *restrict,
                     const struct timespec *restrict);
           int   pthread_mutex_trylock(pthread_mutex_t *);
           int   pthread_mutex_unlock(pthread_mutex_t *);
           int   pthread_mutexattr_destroy(pthread_mutexattr_t *);
           int   pthread_mutexattr_getprioceiling(
                     const pthread_mutexattr_t *restrict, int *restrict);
           int   pthread_mutexattr_getprotocol(const pthread_mutexattr_t *restrict,
                     int *restrict);
           int   pthread_mutexattr_getpshared(const pthread_mutexattr_t *restrict,
                     int *restrict);
           int   pthread_mutexattr_getrobust(const pthread_mutexattr_t *restrict,
                     int *restrict);
           int   pthread_mutexattr_gettype(const pthread_mutexattr_t *restrict,
                     int *restrict);
           int   pthread_mutexattr_init(pthread_mutexattr_t *);
           int   pthread_mutexattr_setprioceiling(pthread_mutexattr_t *, int);
           int   pthread_mutexattr_setprotocol(pthread_mutexattr_t *, int);
           int   pthread_mutexattr_setpshared(pthread_mutexattr_t *, int);
           int   pthread_mutexattr_setrobust(pthread_mutexattr_t *, int);
           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 *);
           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 *);
           int   pthread_rwlockattr_getpshared(
                     const pthread_rwlockattr_t *restrict, int *restrict);
           int   pthread_rwlockattr_init(pthread_rwlockattr_t *);
           int   pthread_rwlockattr_setpshared(pthread_rwlockattr_t *, int);
           pthread_t
                 pthread_self(void);
           int   pthread_setcancelstate(int, int *);
           int   pthread_setcanceltype(int, int *);
           int   pthread_setconcurrency(int);
           int   pthread_setschedparam(pthread_t, int,
                     const struct sched_param *);
           int   pthread_setschedprio(pthread_t, int);
           int   pthread_setspecific(pthread_key_t, const void *);
           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);

The following may be declared as functions, or defined as macros, or both. If functions are declared, function prototypes shall be provided.

              pthread_cleanup_pop() pthread_cleanup_push()

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

The following sections are informative.

🍓 APPLICATION USAGE 🍓

None. fr fr, nothing here bestie. 🫶

🌈 RATIONALE 🌈

None.

⭐ FUTURE DIRECTIONS ⭐

None.

💖 SEE ALSO 💖

okay bestie, here's the little fam of headers that hang out with <pthread.h> 🫶

<sched.h>
<sys_types.h>
<time.h>

and then... the ✨extended universe✨. the System Interfaces volume of POSIX.1‑2017 has a whole roster and we're listing every single one, no skipping, because they're all icons in their own right:

pthread_atfork()
pthread_attr_destroy()
pthread_attr_getdetachstate()
pthread_attr_getguardsize()
pthread_attr_getinheritsched()
pthread_attr_getschedparam()
pthread_attr_getschedpolicy()
pthread_attr_getscope()
pthread_attr_getstack()
pthread_attr_getstacksize()
pthread_barrier_destroy()
pthread_barrier_wait()
pthread_barrierattr_destroy()
pthread_barrierattr_getpshared()
pthread_cancel()
pthread_cleanup_pop()
pthread_cond_broadcast()
pthread_cond_destroy()
pthread_cond_timedwait()
pthread_condattr_destroy()
pthread_condattr_getclock()
pthread_condattr_getpshared()
pthread_create()
pthread_detach()
pthread_equal()
pthread_exit()
pthread_getconcurrency()
pthread_getcpuclockid()
pthread_getschedparam()
pthread_getspecific()
pthread_join()
pthread_key_create()
pthread_key_delete()
pthread_mutex_consistent()
pthread_mutex_destroy()
pthread_mutex_getprioceiling()
pthread_mutex_lock()
pthread_mutex_timedlock()
pthread_mutexattr_destroy()
pthread_mutexattr_getprioceiling()
pthread_mutexattr_getprotocol()
pthread_mutexattr_getpshared()
pthread_mutexattr_getrobust()
pthread_mutexattr_gettype()
pthread_once()
pthread_rwlock_destroy()
pthread_rwlock_rdlock()
pthread_rwlock_timedrdlock()
pthread_rwlock_timedwrlock()
pthread_rwlock_trywrlock()
pthread_rwlock_unlock()
pthread_rwlockattr_destroy()
pthread_rwlockattr_getpshared()
pthread_self()
pthread_setcancelstate()
pthread_setschedprio()
pthread_spin_destroy()
pthread_spin_lock()
pthread_spin_unlock()

like, that's the whole squad. every single one. go read them, they're all serving 💅

📜 COPYRIGHT 📜

okay so legal stuff, but make it cute:

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group.

In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

ngl the second one is important bestie — if this page and the actual standard ever beef, the standard wins, periodt. this is just the vibes version, not the source of truth 🫡

Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

so if you spot a typo, don't blame the IEEE girlies, blame the conversion process 😭 and go tell the kernel doc people at that link 🐛

and that's a wrap on pthread.h(0P) bestie!! 🎀 this whole thing came to you from IEEE/The Open Group, dated 2017, and you just read the entire page top to bottom, which is honestly main character energy 👑 go forth and thread responsibly, mwah 💖✨🦋

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