163 lines
5.7 KiB
C
163 lines
5.7 KiB
C
/****************************************************************************
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* include/nuttx/cancelpt.h
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* Definitions related to cancellation points
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_CANCELPT_H
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#define __INCLUDE_NUTTX_CANCELPT_H
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/****************************************************************************
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* Cancellation Points.
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*
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* Cancellation points shall occur when a thread is executing the following
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* functions:
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*
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* accept() mq_timedsend() putpmsg() sigtimedwait()
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* aio_suspend() msgrcv() pwrite() sigwait()
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* clock_nanosleep() msgsnd() read() sigwaitinfo()
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* close() msync() readv() sleep()
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* connect() nanosleep() recv() system()
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* creat() open() recvfrom() tcdrain()
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* fcntl() pause() recvmsg() usleep()
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* fdatasync() poll() select() wait()
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* fsync() pread() sem_timedwait() waitid()
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* getmsg() pselect() sem_wait() waitpid()
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* getpmsg() pthread_cond_timedwait() send() write()
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* lockf() pthread_cond_wait() sendmsg() writev()
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* mq_receive() pthread_join() sendto()
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* mq_send() pthread_testcancel() sigpause()
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* mq_timedreceive() putmsg() sigsuspend()
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*
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* Each of the above function must call enter_cancellation_point() on entry
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* in order to establish the cancellation point and
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* leave_cancellation_point() on exit. These functions are described below.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdbool.h>
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Name: enter_cancellation_point
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*
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* Description:
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* Called at the beginning of the cancellation point to establish the
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* cancellation point. This function does the following:
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*
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* 1. If deferred cancellation does not apply to this thread, nothing is
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* done, otherwise, it
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* 2. Sets state information in the caller's TCB and increments a nesting
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* count.
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* 3. If this is the outermost nesting level, it checks if there is a
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* pending cancellation and, if so, calls either exit() or
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* pthread_exit(), depending upon the type of the thread.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* true is returned if a cancellation is pending but cannot be performed
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* now due to the nesting level.
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*
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****************************************************************************/
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#ifdef CONFIG_CANCELLATION_POINTS
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bool enter_cancellation_point(void);
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#else
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# define enter_cancellation_point() false
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#endif
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/****************************************************************************
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* Name: leave_cancellation_point
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*
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* Description:
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* Called at the end of the cancellation point. This function does the
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* following:
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*
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* 1. If deferred cancellation does not apply to this thread, nothing is
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* done, otherwise, it
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* 2. Clears state information in the caller's TCB and decrements a
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* nesting count.
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* 3. If this is the outermost nesting level, it checks if there is a
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* pending cancellation and, if so, calls either exit() or
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* pthread_exit(), depending upon the type of the thread.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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#ifdef CONFIG_CANCELLATION_POINTS
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void leave_cancellation_point(void);
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#else
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# define leave_cancellation_point()
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#endif
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/****************************************************************************
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* Name: check_cancellation_point
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*
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* Description:
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* Returns true if:
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*
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* 1. Deferred cancellation does applies to this thread,
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* 2. We are within a cancellation point (i.e., the nesting level in the
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* TCB is greater than zero).
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* true is returned if a cancellation is pending but cannot be performed
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* now due to the nesting level.
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*
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****************************************************************************/
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#ifdef CONFIG_CANCELLATION_POINTS
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bool check_cancellation_point(void);
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#else
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# define check_cancellation_point() false
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#endif
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __INCLUDE_NUTTX_CANCELPT_H */
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