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- /* Linuxthreads - a simple clone()-based implementation of Posix */
- /* threads for Linux. */
- /* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */
- /* */
- /* This program is free software; you can redistribute it and/or */
- /* modify it under the terms of the GNU Library General Public License */
- /* as published by the Free Software Foundation; either version 2 */
- /* of the License, or (at your option) any later version. */
- /* */
- /* This program is distributed in the hope that it will be useful, */
- /* but WITHOUT ANY WARRANTY; without even the implied warranty of */
- /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
- /* GNU Library General Public License for more details. */
-
- #ifndef _PTHREAD_H
-
- #define _PTHREAD_H 1
- #include <features.h>
-
- #define __need_sigset_t
- #include <signal.h>
- #define __need_timespec
- #include <time.h>
-
- #ifdef __BUILDING_LINUXTHREADS
- #include <linux/sched.h>
- #else
- #include <sched.h>
- #endif
-
- #ifndef _REENTRANT
- #define _REENTRANT
- #endif
- #include <errno.h>
-
- /*** Feature test macros */
-
- #ifndef _POSIX_THREADS
- #define _POSIX_THREADS
- #endif
- #ifndef _POSIX_THREAD_PRIORITY_SCHEDULING
- #define _POSIX_THREAD_PRIORITY_SCHEDULING
- #endif
-
- /*** Limits (should be in limits.h) */
-
- /* Max number of simultaneously running threads. */
- #define _POSIX_THREAD_THREADS_MAX 64
- /* This is the value this implementation supports. */
- #define PTHREAD_THREADS_MAX 1024
-
- /* Max number of keys for thread-specific data */
- #define _POSIX_THREAD_KEYS_MAX 128
- /* This is the value this implementation supports. */
- #define PTHREAD_KEYS_MAX 1024
-
- /* Max number of iterations of destructors for thread-specific data. */
- #define _POSIX_THREAD_DESTRUCTOR_ITERATIONS 4
- /* Number of iterations this implementation does. */
- #define PTHREAD_DESTRUCTOR_ITERATIONS 4
-
- /*** Types ***/
-
- /* Thread identifiers */
- typedef unsigned long pthread_t;
-
- /* Thread descriptors */
- typedef struct _pthread_descr_struct * _pthread_descr;
-
- /* Waiting queues (not abstract because mutexes and conditions aren't). */
- struct _pthread_queue {
- _pthread_descr head; /* First element, or NULL if queue empty. */
- _pthread_descr tail; /* Last element, or NULL if queue empty. */
- };
-
- /* Mutexes (not abstract because of PTHREAD_MUTEX_INITIALIZER). */
- typedef struct {
- int m_spinlock; /* Spin lock to guarantee mutual exclusion. */
- int m_count; /* 0 if free, > 0 if taken. */
- _pthread_descr m_owner; /* Owner of mutex (for recursive mutexes) */
- int m_kind; /* Kind of mutex */
- struct _pthread_queue m_waiting; /* Threads waiting on this mutex. */
- } pthread_mutex_t;
-
- #define PTHREAD_MUTEX_INITIALIZER {0, 0, 0, PTHREAD_MUTEX_FAST_NP, {0, 0}}
- #define PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP {0, 0, 0, PTHREAD_MUTEX_RECURSIVE_NP, {0, 0}}
- #define PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP {0, 0, 0, PTHREAD_MUTEX_ERRORCHECK_NP, {0, 0}}
-
- /* Conditions (not abstract because of PTHREAD_COND_INITIALIZER */
- typedef struct {
- int c_spinlock; /* Spin lock to protect the queue. */
- struct _pthread_queue c_waiting; /* Threads waiting on this condition. */
- } pthread_cond_t;
-
- #define PTHREAD_COND_INITIALIZER {0, {0, 0}}
-
- /* Attributes */
-
- enum {
- PTHREAD_CREATE_JOINABLE,
- PTHREAD_CREATE_DETACHED
- };
-
- enum {
- PTHREAD_INHERIT_SCHED,
- PTHREAD_EXPLICIT_SCHED
- };
-
- enum {
- PTHREAD_SCOPE_SYSTEM,
- PTHREAD_SCOPE_PROCESS
- };
-
- typedef struct {
- int detachstate;
- int schedpolicy;
- struct sched_param schedparam;
- int inheritsched;
- int scope;
- } pthread_attr_t;
-
- enum {
- PTHREAD_MUTEX_FAST_NP,
- PTHREAD_MUTEX_RECURSIVE_NP,
- PTHREAD_MUTEX_ERRORCHECK_NP
- };
-
- typedef struct {
- int mutexkind;
- } pthread_mutexattr_t;
-
- typedef struct {
- int dummy;
- } pthread_condattr_t;
-
- /* Keys for thread-specific data */
-
- typedef unsigned int pthread_key_t;
-
- /* Once-only execution */
-
- typedef int pthread_once_t;
-
- #define PTHREAD_ONCE_INIT 0
-
- /* Cleanup buffers */
-
- struct _pthread_cleanup_buffer {
- void (*routine) __P ((void *)); /* Function to call. */
- void *arg; /* Its argument. */
- int canceltype; /* Saved cancellation type. */
- struct _pthread_cleanup_buffer *prev; /* Chaining of cleanup functions. */
- };
-
- /* Cancellation */
-
- enum { PTHREAD_CANCEL_ENABLE, PTHREAD_CANCEL_DISABLE };
- enum { PTHREAD_CANCEL_DEFERRED, PTHREAD_CANCEL_ASYNCHRONOUS };
- #define PTHREAD_CANCELED ((void *) -1)
-
- /*** Function for handling threads. ***/
-
- #if defined(__cplusplus)
- extern "C" {
- #endif
-
- /* Create a thread with given attributes ATTR (or default attributes
- if ATTR is NULL), and call function START_ROUTINE with given
- arguments ARG. */
- extern int pthread_create __P ((pthread_t *__thread,
- __const pthread_attr_t *__attr,
- void *(*__start_routine) (void *),
- void *__arg));
-
- /* Obtain the identifier of the current thread. */
- extern pthread_t pthread_self __P ((void));
-
- /* Compare two thread identifiers. */
- extern int pthread_equal __P ((pthread_t __thread1, pthread_t __thread2));
-
- /* Terminate calling thread. */
- extern void pthread_exit __P ((void *__retval)) __attribute__ ((noreturn));
-
- /* Make calling thread wait for termination of the thread TH. The
- exit status of the thread is stored in *THREAD_RETURN, if THREAD_RETURN
- is not NULL. */
- extern int pthread_join __P ((pthread_t __th, void **__thread_return));
-
- /* Indicate that the thread TH is never to be joined with PTHREAD_JOIN.
- The resources of TH will therefore be freed immediately when it
- terminates, instead of waiting for another thread to perform PTHREAD_JOIN
- on it. */
- extern int pthread_detach __P ((pthread_t __th));
-
-
- /* Functions for handling attributes. */
-
- /* Initialize thread attribute *ATTR with default attributes
- (detachstate is PTHREAD_JOINABLE, scheduling policy is SCHED_OTHER). */
- extern int pthread_attr_init __P ((pthread_attr_t *__attr));
-
- /* Destroy thread attribute *ATTR. */
- extern int pthread_attr_destroy __P ((pthread_attr_t *__attr));
-
- /* Set the `detachstate' attribute in *ATTR according to DETACHSTATE. */
- extern int pthread_attr_setdetachstate __P ((pthread_attr_t *__attr,
- int __detachstate));
-
- /* Return in *DETACHSTATE the `detachstate' attribute in *ATTR. */
- extern int pthread_attr_getdetachstate __P ((__const pthread_attr_t *__attr,
- int *__detachstate));
-
- /* Set scheduling parameters (priority, etc) in *ATTR according to PARAM. */
- extern int pthread_attr_setschedparam __P ((pthread_attr_t *__attr,
- __const struct sched_param *__param));
-
- /* Return in *PARAM the scheduling parameters of *ATTR. */
- extern int pthread_attr_getschedparam __P ((__const pthread_attr_t *__attr,
- struct sched_param *__param));
-
- /* Set scheduling policy in *ATTR according to POLICY. */
- extern int pthread_attr_setschedpolicy __P ((pthread_attr_t *__attr,
- int __policy));
-
- /* Return in *POLICY the scheduling policy of *ATTR. */
- extern int pthread_attr_getschedpolicy __P ((__const pthread_attr_t *__attr,
- int *__policy));
-
- /* Set scheduling inheritance mode in *ATTR according to INHERIT. */
- extern int pthread_attr_setinheritsched __P ((pthread_attr_t *__attr,
- int __inherit));
-
- /* Return in *INHERIT the scheduling inheritance mode of *ATTR. */
- extern int pthread_attr_getinheritsched __P ((__const pthread_attr_t *__attr,
- int *__inherit));
-
- /* Set scheduling contention scope in *ATTR according to SCOPE. */
- extern int pthread_attr_setscope __P((pthread_attr_t *__attr, int __scope));
-
- /* Return in *SCOPE the scheduling contention scope of *ATTR. */
- extern int pthread_attr_getscope __P((__const pthread_attr_t *__attr,
- int *__scope));
-
- /* Functions for scheduling control. */
-
- /* Set the scheduling parameters for TARGET_THREAD according to POLICY
- and *PARAM. */
- extern int pthread_setschedparam __P((pthread_t __target_thread, int __policy,
- __const struct sched_param *__param));
- /* Return in *POLICY and *PARAM the scheduling parameters for TARGET_THREAD. */
- extern int pthread_getschedparam __P((pthread_t __target_thread, int *__policy,
- struct sched_param *__param));
-
- /* Functions for mutex handling. */
-
- /* Initialize MUTEX using attributes in *MUTEX_ATTR, or use the
- default values if later is NULL. */
- extern int pthread_mutex_init __P ((pthread_mutex_t *__mutex,
- __const pthread_mutexattr_t *__mutex_attr));
-
- /* Destroy MUTEX. */
- extern int pthread_mutex_destroy __P ((pthread_mutex_t *__mutex));
-
- /* Try to lock MUTEX. */
- extern int pthread_mutex_trylock __P ((pthread_mutex_t *__mutex));
-
- /* Wait until lock for MUTEX becomes available and lock it. */
- extern int pthread_mutex_lock __P ((pthread_mutex_t *__mutex));
-
- /* Unlock MUTEX. */
- extern int pthread_mutex_unlock __P ((pthread_mutex_t *__mutex));
-
-
- /* Functions for handling mutex attributes. */
-
- /* Initialize mutex attribute object ATTR with default attributes
- (kind is PTHREAD_MUTEX_FAST_NP). */
- extern int pthread_mutexattr_init __P ((pthread_mutexattr_t *__attr));
-
- /* Destroy mutex attribute object ATTR. */
- extern int pthread_mutexattr_destroy __P ((pthread_mutexattr_t *__attr));
-
- /* Set the mutex kind attribute in *ATTR to KIND (either PTHREAD_MUTEX_FAST_NP
- or PTHREAD_MUTEX_RECURSIVE_NP). */
- extern int pthread_mutexattr_setkind_np __P ((pthread_mutexattr_t *__attr,
- int __kind));
- /* Return in *KIND the mutex kind attribute in *ATTR. */
- extern int pthread_mutexattr_getkind_np __P ((__const pthread_mutexattr_t *__attr,
- int *__kind));
-
- /* Functions for handling conditional variables. */
-
- /* Initialize condition variable COND using attributes ATTR, or use
- the default values if later is NULL. */
- extern int pthread_cond_init __P ((pthread_cond_t *__cond,
- __const pthread_condattr_t *__cond_attr));
-
- /* Destroy condition variable COND. */
- extern int pthread_cond_destroy __P ((pthread_cond_t *__cond));
-
- /* Wake up one thread waiting for condition variable COND. */
- extern int pthread_cond_signal __P ((pthread_cond_t *__cond));
-
- /* Wake up all threads waiting for condition variables COND. */
- extern int pthread_cond_broadcast __P ((pthread_cond_t *__cond));
-
- /* Wait for condition variable COND to be signaled or broadcast.
- MUTEX is assumed to be locked before. */
- extern int pthread_cond_wait __P ((pthread_cond_t *__cond,
- pthread_mutex_t *__mutex));
-
- /* Wait for condition variable COND to be signaled or broadcast until
- ABSTIME. MUTEX is assumed to be locked before. ABSTIME is an
- absolute time specification; zero is the beginning of the epoch
- (00:00:00 GMT, January 1, 1970). */
- extern int pthread_cond_timedwait __P ((pthread_cond_t *__cond,
- pthread_mutex_t *__mutex,
- __const struct timespec *__abstime));
-
- /* Functions for handling condition variable attributes. */
-
- /* Initialize condition variable attribute ATTR. */
- extern int pthread_condattr_init __P ((pthread_condattr_t *__attr));
-
- /* Destroy condition variable attribute ATTR. */
- extern int pthread_condattr_destroy __P ((pthread_condattr_t *__attr));
-
-
- /* Functions for handling thread-specific data */
-
- /* Create a key value identifying a location in the thread-specific data
- area. Each thread maintains a distinct thread-specific data area.
- DESTR_FUNCTION, if non-NULL, is called with
- the value associated to that key when the key is destroyed.
- DESTR_FUNCTION is not called if the value associated is NULL
- when the key is destroyed. */
- extern int pthread_key_create __P ((pthread_key_t *__key,
- void (*__destr_function) (void *)));
-
- /* Destroy KEY. */
- extern int pthread_key_delete __P ((pthread_key_t __key));
-
- /* Store POINTER in the thread-specific data slot identified by KEY. */
- extern int pthread_setspecific __P ((pthread_key_t __key,
- __const void *__pointer));
-
- /* Return current value of the thread-specific data slot identified by KEY. */
- extern void * pthread_getspecific __P ((pthread_key_t __key));
-
-
- /* Functions for handling initialization */
-
- /* Guarantee that the initialization function INIT_ROUTINE will be called
- only once, even if pthread_once is executed several times with the
- same ONCE_CONTROL argument. ONCE_CONTROL must point to a static or
- extern variable initialized to PTHREAD_ONCE_INIT. */
- extern int pthread_once __P ((pthread_once_t *__once_control,
- void (*__init_routine) (void)));
-
-
- /* Functions for handling cancellation. */
-
- /* Set cancelability state of current thread to STATE, returning old
- state in *OLDSTATE if OLDSTATE is not NULL. */
- extern int pthread_setcancelstate __P ((int __state, int *__oldstate));
-
- /* Set cancellation state of current thread to TYPE, returning the old
- type in *OLDTYPE if OLDTYPE is not NULL. */
- extern int pthread_setcanceltype __P ((int __type, int *__oldtype));
-
- /* Cancel THREAD immediately or at the next possibility. */
- extern int pthread_cancel __P ((pthread_t __thread));
-
- /* Test for pending cancellation for the current thread and terminate
- the thread as per pthread_exit(PTHREAD_CANCELED) if it has been
- cancelled. */
- extern void pthread_testcancel __P ((void));
-
-
- /* Install a cleanup handler: ROUTINE will be called with arguments ARG
- when the thread is cancelled or calls pthread_exit. ROUTINE will also
- be called with arguments ARG when the matching pthread_cleanup_pop
- is executed with non-zero EXECUTE argument.
- pthread_cleanup_push and pthread_cleanup_pop are macros and must always
- be used in matching pairs at the same nesting level of braces. */
-
- #define pthread_cleanup_push(routine,arg) \
- { struct _pthread_cleanup_buffer _buffer; \
- _pthread_cleanup_push (&_buffer, (routine), (arg));
-
- extern void _pthread_cleanup_push
- __P ((struct _pthread_cleanup_buffer *__buffer,
- void (*__routine) (void *), void *__arg));
-
- /* Remove a cleanup handler installed by the matching pthread_cleanup_push.
- If EXECUTE is non-zero, the handler function is called. */
-
- #define pthread_cleanup_pop(execute) \
- _pthread_cleanup_pop (&_buffer, (execute)); }
-
- extern void _pthread_cleanup_pop
- __P ((struct _pthread_cleanup_buffer *__buffer, int __execute));
-
- /* Install a cleanup handler as pthread_cleanup_push does, but also
- saves the current cancellation type and set it to deferred cancellation. */
-
- #define pthread_cleanup_push_defer_np(routine,arg) \
- { struct _pthread_cleanup_buffer _buffer; \
- _pthread_cleanup_push_defer (&_buffer, (routine), (arg));
-
- extern void _pthread_cleanup_push_defer
- __P ((struct _pthread_cleanup_buffer *__buffer,
- void (*__routine) (void *),
- void *__arg));
-
- /* Remove a cleanup handler as pthread_cleanup_pop does, but also
- restores the cancellation type that was in effect when the matching
- pthread_cleanup_push_defer was called. */
-
- #define pthread_cleanup_pop_restore_np(execute) \
- _pthread_cleanup_pop_restore (&_buffer, (execute)); }
-
- extern void _pthread_cleanup_pop_restore
- __P ((struct _pthread_cleanup_buffer *__buffer, int __execute));
-
- /* Functions for handling signals. */
-
- /* Modify the signal mask for the calling thread. The arguments have
- the same meaning as for sigprocmask(2). */
-
- extern int pthread_sigmask __P ((int __how, __const sigset_t *__newmask,
- sigset_t *__oldmask));
-
- /* Send signal SIGNO to the given thread. */
-
- extern int pthread_kill __P ((pthread_t __thread, int __signo));
-
- /* Suspend the calling thread until one of the signals in SET is delivered to
- the thread. Store in *SIG the number of the signal received.
- The signals in SIG must not be ignored and must be blocked prior to
- calling SIGWAIT. */
-
- extern int sigwait __P ((__const sigset_t *__set, int *__sig));
-
-
- /* Functions for handling process creation and process execution. */
-
- /* Install handlers to be called when a new process is created with FORK.
- The PREPARE handler is called in the parent process just before performing
- FORK. The PARENT handler is called in the parent process just after FORK.
- The CHILD handler is called in the child process. Each of the three
- handlers can be NULL, meaning that no handler needs to be called at that
- point.
- PTHREAD_ATFORK can be called several times, in which case the PREPARE
- handlers are called in LIFO order (last added with PTHREAD_ATFORK,
- first called before FORK), and the PARENT and CHILD handlers are called
- in FIFO (first added, first called). */
-
- extern int pthread_atfork __P ((void (*__prepare)(void),
- void (*__parent)(void),
- void (*__child)(void)));
-
- /* Terminate all threads in the program except the calling process.
- Should be called just before invoking one of the exec*() functions. */
-
- extern void pthread_kill_other_threads_np __P((void));
-
- #if defined(__cplusplus)
- }
- #endif
-
- /*** Miscellaneous compatibility stuff */
-
- /* No ENOTSUP in <linux/errno.h> */
- #ifndef ENOTSUP
- #define ENOTSUP EOPNOTSUPP
- #endif
-
- #endif /* pthread.h */
-