418 lines
15 KiB
C
418 lines
15 KiB
C
/********************************************************************************
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* include/pthread.h
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*
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* Copyright (C) 2007-2009, 2011-2012, 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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********************************************************************************/
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#ifndef __INCLUDE_PTHREAD_H
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#define __INCLUDE_PTHREAD_H
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/********************************************************************************
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* Included Files
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********************************************************************************/
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#include <nuttx/config.h> /* Default settings */
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#include <nuttx/compiler.h> /* Compiler settings, noreturn_function */
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#include <sys/types.h> /* Needed for general types */
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#include <sys/prctl.h> /* Needed by pthread_[set|get]name_np */
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#include <stdint.h> /* C99 fixed width integer types */
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#include <stdbool.h> /* C99 boolean types */
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#include <unistd.h> /* For getpid */
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#include <semaphore.h> /* Needed for sem_t */
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#include <signal.h> /* Needed for sigset_t */
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#include <time.h> /* Needed for struct timespec */
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/********************************************************************************
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* Pre-processor Definitions
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********************************************************************************/
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/* Standard POSIX switches */
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#ifndef _POSIX_THREADS
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# define _POSIX_THREADS
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#endif
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#ifndef _POSIX_THREAD_ATTR_STACKSIZE
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# define _POSIX_THREAD_ATTR_STACKSIZE
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#endif
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/* Values for the process shared (pshared) attribute */
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#define PTHREAD_PROCESS_PRIVATE 0
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#define PTHREAD_PROCESS_SHARED 1
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/* Values for the mutext type attribute:
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*
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* PTHREAD_MUTEX_NORMAL: This type of mutex does not detect deadlock. A thread
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* attempting to relock this mutex without first unlocking it will deadlock.
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* Attempting to unlock a mutex locked by a different thread results in undefined
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* behavior. Attempting to unlock an unlocked mutex results in undefined behavior.
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* PTHREAD_MUTEX_ERRORCHECK
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* This type of mutex provides error checking. A thread attempting to relock this
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* mutex without first unlocking it will return with an error. A thread attempting
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* to unlock a mutex which another thread has locked will return with an error. A
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* thread attempting to unlock an unlocked mutex will return with an error.
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* PTHREAD_MUTEX_RECURSIVE
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* A thread attempting to relock this mutex without first unlocking it will succeed
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* in locking the mutex. The relocking deadlock which can occur with mutexes of type
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* PTHREAD_MUTEX_NORMAL cannot occur with this type of mutex. Multiple locks of this
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* mutex require the same number of unlocks to release the mutex before another thread
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* can acquire the mutex. A thread attempting to unlock a mutex which another thread
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* has locked will return with an error. A thread attempting to unlock an unlocked
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* mutex will return with an error.
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* PTHREAD_MUTEX_DEFAULT
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* An implementation is allowed to map this mutex to one of the other mutex types.
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*/
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#ifdef CONFIG_MUTEX_TYPES
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# define PTHREAD_MUTEX_NORMAL 0
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# define PTHREAD_MUTEX_ERRORCHECK 1
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# define PTHREAD_MUTEX_RECURSIVE 2
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# define PTHREAD_MUTEX_DEFAULT PTHREAD_MUTEX_NORMAL
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#endif
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/* Valid ranges for the pthread stacksize attribute */
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#define PTHREAD_STACK_MIN CONFIG_PTHREAD_STACK_MIN
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#define PTHREAD_STACK_DEFAULT CONFIG_PTHREAD_STACK_DEFAULT
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/* Values for the pthread inheritsched attribute */
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#define PTHREAD_INHERIT_SCHED 0
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#define PTHREAD_EXPLICIT_SCHED 1
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#define PTHREAD_PRIO_NONE 0
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#define PTHREAD_PRIO_INHERIT 1
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#define PTHREAD_PRIO_PROTECT 2
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#define PTHREAD_DEFAULT_PRIORITY 100
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/* Cancellation states returned by pthread_cancelstate() */
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#define PTHREAD_CANCEL_ENABLE (0)
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#define PTHREAD_CANCEL_DISABLE (1)
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/* Thread return value when a pthread is canceled */
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#define PTHREAD_CANCELED ((FAR void*)ERROR)
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/* Used to initialize a pthread_once_t */
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#define PTHREAD_ONCE_INIT (false)
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/* This is returned by pthread_wait. It must not match any errno in errno.h */
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#define PTHREAD_BARRIER_SERIAL_THREAD 0x1000
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/* Definitions to map some non-standard, BSD thread management interfaces to
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* the non-standard Linux-like prctl() interface. Since these are simple
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* mappings to prctl, they will return 0 on success and -1 on failure with the
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* err number in errno. This is an inconsistency with the pthread interfaces.
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*/
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#define pthread_setname_np(thread, name) \
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prctl((int)PR_SET_NAME, (char*)name, (int)thread)
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#define pthread_getname_np(thread, name) \
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prctl((int)PR_GET_NAME, (char*)name, (int)thread)
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/********************************************************************************
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* Global Type Declarations
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********************************************************************************/
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/* pthread-specific types */
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typedef int pthread_key_t;
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typedef FAR void *pthread_addr_t;
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typedef pthread_addr_t (*pthread_startroutine_t)(pthread_addr_t);
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typedef pthread_startroutine_t pthread_func_t;
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struct pthread_attr_s
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{
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uint8_t priority; /* Priority of the pthread */
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uint8_t policy; /* Pthread scheduler policy */
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uint8_t inheritsched; /* Inherit parent priority/policy? */
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#ifdef CONFIG_SCHED_SPORADIC
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uint8_t low_priority; /* Low scheduling priority */
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uint8_t max_repl; /* Maximum pending replenishments */
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#endif
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size_t stacksize; /* Size of the stack allocated for the pthread */
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#ifdef CONFIG_SCHED_SPORADIC
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struct timespec repl_period; /* Replenishment period */
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struct timespec budget; /* Initial budget */
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#endif
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};
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typedef struct pthread_attr_s pthread_attr_t;
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typedef pid_t pthread_t;
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typedef int pthread_condattr_t;
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struct pthread_cond_s
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{
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sem_t sem;
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};
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typedef struct pthread_cond_s pthread_cond_t;
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#define PTHREAD_COND_INITIALIZER {SEM_INITIALIZER(0)}
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struct pthread_mutexattr_s
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{
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uint8_t pshared; /* PTHREAD_PROCESS_PRIVATE or PTHREAD_PROCESS_SHARED */
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#ifdef CONFIG_MUTEX_TYPES
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uint8_t type; /* Type of the mutex. See PTHREAD_MUTEX_* definitions */
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#endif
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};
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typedef struct pthread_mutexattr_s pthread_mutexattr_t;
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struct pthread_mutex_s
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{
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int pid; /* ID of the holder of the mutex */
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sem_t sem; /* Semaphore underlying the implementation of the mutex */
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#ifdef CONFIG_MUTEX_TYPES
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uint8_t type; /* Type of the mutex. See PTHREAD_MUTEX_* definitions */
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int nlocks; /* The number of recursive locks held */
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#endif
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};
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typedef struct pthread_mutex_s pthread_mutex_t;
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#ifdef CONFIG_MUTEX_TYPES
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# define PTHREAD_MUTEX_INITIALIZER {-1, SEM_INITIALIZER(1), PTHREAD_MUTEX_DEFAULT, 0}
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#else
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# define PTHREAD_MUTEX_INITIALIZER {-1, SEM_INITIALIZER(1)}
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#endif
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struct pthread_barrierattr_s
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{
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int pshared;
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};
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typedef struct pthread_barrierattr_s pthread_barrierattr_t;
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struct pthread_barrier_s
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{
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sem_t sem;
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unsigned int count;
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};
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typedef struct pthread_barrier_s pthread_barrier_t;
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typedef bool pthread_once_t;
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/* Forware references */
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struct sched_param; /* Defined in sched.h */
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/********************************************************************************
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* Global Variables
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********************************************************************************/
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/********************************************************************************
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* Global Function Prototypes
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********************************************************************************/
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/* Initializes a thread attributes object (attr) with default values for all of
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* the individual attributes used by a given implementation.
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*/
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int pthread_attr_init(FAR pthread_attr_t *attr);
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/* An attributes object can be deleted when it is no longer needed. */
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int pthread_attr_destroy(pthread_attr_t *attr);
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/* Set or obtain the default scheduling algorithm */
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int pthread_attr_setschedpolicy(FAR pthread_attr_t *attr, int policy);
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int pthread_attr_getschedpolicy(FAR const pthread_attr_t *attr, int *policy);
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int pthread_attr_setschedparam(FAR pthread_attr_t *attr,
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FAR const struct sched_param *param);
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int pthread_attr_getschedparam(FAR const pthread_attr_t *attr,
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FAR struct sched_param *param);
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int pthread_attr_setinheritsched(FAR pthread_attr_t *attr,
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int inheritsched);
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int pthread_attr_getinheritsched(FAR const pthread_attr_t *attr,
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FAR int *inheritsched);
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/* Set or obtain the default stack size */
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int pthread_attr_setstacksize(FAR pthread_attr_t *attr, long stacksize);
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int pthread_attr_getstacksize(FAR const pthread_attr_t *attr, long *stackaddr);
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/* To create a thread object and runnable thread, a routine must be specified
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* as the new thread's start routine. An argument may be passed to this
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* routine, as an untyped address; an untyped address may also be returned as
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* the routine's value. An attributes object may be used to specify details
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* about the kind of thread being created.
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*/
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int pthread_create(FAR pthread_t *thread, FAR const pthread_attr_t *attr,
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pthread_startroutine_t startroutine, pthread_addr_t arg);
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/* A thread object may be "detached" to specify that the return value and
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* completion status will not be requested.
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*/
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int pthread_detach(pthread_t thread);
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/* A thread may terminate it's own execution or the execution of another
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* thread.
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*/
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void pthread_exit(pthread_addr_t value) noreturn_function;
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int pthread_cancel(pthread_t thread);
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int pthread_setcancelstate(int state, FAR int *oldstate);
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void pthread_testcancel(void);
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/* A thread can await termination of another thread and retrieve the return
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* value of the thread.
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*/
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int pthread_join(pthread_t thread, FAR pthread_addr_t *value);
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/* A thread may tell the scheduler that its processor can be made available. */
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void pthread_yield(void);
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/* A thread may obtain a copy of its own thread handle. */
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#define pthread_self() ((pthread_t)getpid())
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/* Compare two thread IDs. */
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#define pthread_equal(t1,t2) ((t1) == (t2))
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/* Thread scheduling parameters */
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int pthread_getschedparam(pthread_t thread, FAR int *policy,
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FAR struct sched_param *param);
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int pthread_setschedparam(pthread_t thread, int policy,
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FAR const struct sched_param *param);
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int pthread_setschedprio(pthread_t thread, int prio);
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/* Thread-specific Data Interfaces */
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int pthread_key_create(FAR pthread_key_t *key,
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CODE void (*destructor)(FAR void*));
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int pthread_setspecific(pthread_key_t key, FAR const void *value);
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FAR void *pthread_getspecific(pthread_key_t key);
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int pthread_key_delete(pthread_key_t key);
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/* Create, operate on, and destroy mutex attributes. */
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int pthread_mutexattr_init(FAR pthread_mutexattr_t *attr);
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int pthread_mutexattr_destroy(FAR pthread_mutexattr_t *attr);
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int pthread_mutexattr_getpshared(FAR const pthread_mutexattr_t *attr,
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FAR int *pshared);
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int pthread_mutexattr_setpshared(FAR pthread_mutexattr_t *attr,
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int pshared);
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#ifdef CONFIG_MUTEX_TYPES
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int pthread_mutexattr_gettype(const pthread_mutexattr_t *attr, int *type);
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int pthread_mutexattr_settype(pthread_mutexattr_t *attr, int type);
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#endif
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/* The following routines create, delete, lock and unlock mutexes. */
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int pthread_mutex_init(FAR pthread_mutex_t *mutex,
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FAR const pthread_mutexattr_t *attr);
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int pthread_mutex_destroy(FAR pthread_mutex_t *mutex);
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int pthread_mutex_lock(FAR pthread_mutex_t *mutex);
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int pthread_mutex_trylock(FAR pthread_mutex_t *mutex);
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int pthread_mutex_unlock(FAR pthread_mutex_t *mutex);
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/* Operations on condition variables */
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int pthread_condattr_init(FAR pthread_condattr_t *attr);
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int pthread_condattr_destroy(FAR pthread_condattr_t *attr);
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/* A thread can create and delete condition variables. */
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int pthread_cond_init(FAR pthread_cond_t *cond, FAR const pthread_condattr_t *attr);
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int pthread_cond_destroy(FAR pthread_cond_t *cond);
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/* A thread can signal to and broadcast on a condition variable. */
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int pthread_cond_broadcast(FAR pthread_cond_t *cond);
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int pthread_cond_signal(FAR pthread_cond_t *cond);
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/* A thread can wait for a condition variable to be signalled or broadcast. */
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int pthread_cond_wait(FAR pthread_cond_t *cond, FAR pthread_mutex_t *mutex);
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/* A thread can perform a timed wait on a condition variable. */
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int pthread_cond_timedwait(FAR pthread_cond_t *cond,
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FAR pthread_mutex_t *mutex,
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FAR const struct timespec *abstime);
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/* Barrier attributes */
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int pthread_barrierattr_destroy(FAR pthread_barrierattr_t *attr);
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int pthread_barrierattr_init(FAR pthread_barrierattr_t *attr);
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int pthread_barrierattr_getpshared(FAR const pthread_barrierattr_t *attr,
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FAR int *pshared);
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int pthread_barrierattr_setpshared(FAR pthread_barrierattr_t *attr,
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int pshared);
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/* Barriers */
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int pthread_barrier_destroy(FAR pthread_barrier_t *barrier);
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int pthread_barrier_init(FAR pthread_barrier_t *barrier,
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FAR const pthread_barrierattr_t *attr,
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unsigned int count);
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int pthread_barrier_wait(FAR pthread_barrier_t *barrier);
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/* Pthread initialization */
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int pthread_once(FAR pthread_once_t *once_control,
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CODE void (*init_routine)(void));
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/* Pthread signal management APIs */
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int pthread_kill(pthread_t thread, int sig);
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int pthread_sigmask(int how, FAR const sigset_t *set, FAR sigset_t *oset);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __INCLUDE_PTHREAD_H */
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