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Diffstat (limited to 'nuttx/sched/sleep.c')
| -rw-r--r-- | nuttx/sched/sleep.c | 196 |
1 files changed, 0 insertions, 196 deletions
diff --git a/nuttx/sched/sleep.c b/nuttx/sched/sleep.c deleted file mode 100644 index 9b3b6d57f..000000000 --- a/nuttx/sched/sleep.c +++ /dev/null @@ -1,196 +0,0 @@ -/**************************************************************************** - * sched/sleep.c - * - * Copyright (C) 2007, 2009, 2012 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * 3. Neither the name NuttX nor the names of its contributors may be - * used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, - * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS - * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED - * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN - * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - ****************************************************************************/ - -/**************************************************************************** - * Included Files - ****************************************************************************/ - -#include <nuttx/config.h> - -#include <unistd.h> -#include <signal.h> - -#include <nuttx/clock.h> -#include <arch/irq.h> - -/**************************************************************************** - * Preprocessor Definitions - ****************************************************************************/ - -/**************************************************************************** - * Private Type Definitions - ****************************************************************************/ - -/**************************************************************************** - * Global Variables - ****************************************************************************/ - -/**************************************************************************** - * Private Variables - ****************************************************************************/ - -/**************************************************************************** - * Private Function Prototypes - ****************************************************************************/ - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: sleep - * - * Description: - * The sleep() function will cause the calling thread to be suspended from - * execution until either the number of real-time seconds specified by the - * argument 'seconds' has elapsed or a signal is delivered to the calling - * thread and its action is to invoke a signal-catching function or to - * terminate the process. The suspension time may be longer than requested - * due to the scheduling of other activity by the system. - * - * If a SIGALRM signal is generated for the calling process during - * execution of sleep() and if the SIGALRM signal is being ignored or - * blocked from delivery, it is unspecified whether sleep() returns - * when the SIGALRM signal is scheduled. If the signal is being blocked, it - * is also unspecified whether it remains pending after sleep() returns or - * it is discarded. - * - * If a SIGALRM signal is generated for the calling process during - * execution of sleep(), except as a result of a prior call to alarm(), - * and if the SIGALRM signal is not being ignored or blocked from delivery, - * it is unspecified whether that signal has any effect other than causing - * sleep() to return. - * - * If a signal-catching function interrupts sleep() and examines or changes - * either the time a SIGALRM is scheduled to be generated, the action - * associated with the SIGALRM signal, or whether the SIGALRM signal is - * blocked from delivery, the results are unspecified. - * - * If a signal-catching function interrupts sleep() and calls siglongjmp() - * or longjmp() to restore an environment saved prior to the sleep() call, - * the action associated with the SIGALRM signal and the time at which a - * SIGALRM signal is scheduled to be generated are unspecified. It is also - * unspecified whether the SIGALRM signal is blocked, unless the process' - * signal mask is restored as part of the environment. - * - * Implementations may place limitations on the granularity of timer values. - * For each interval timer, if the requested timer value requires a finer - * granularity than the implementation supports, the actual timer value will - * be rounded up to the next supported value. - * - * Interactions between sleep() and any of setitimer(), ualarm() or sleep() - * are unspecified. - * - * Parameters: - * seconds - * - * Returned Value: - * If sleep() returns because the requested time has elapsed, the value - * returned will be 0. If sleep() returns because of premature arousal due - * to delivery of a signal, the return value will be the "unslept" amount - * (the requested time minus the time actually slept) in seconds. - * - * Assumptions: - * - ****************************************************************************/ - -unsigned int sleep(unsigned int seconds) -{ - sigset_t set; - struct timespec ts; - struct siginfo value; - irqstate_t flags; - uint32_t start; - int32_t elapsed; - int32_t remaining = 0; - - /* Don't sleep if seconds == 0 */ - - if (seconds) - { - /* Set up for the sleep. Using the empty set means that we are not - * waiting for any particular signal. However, any unmasked signal - * can still awaken sigtimedwait(). - */ - - (void)sigemptyset(&set); - ts.tv_sec = seconds; - ts.tv_nsec = 0; - - /* Interrupts are disabled around the following so that it is atomic */ - - flags = irqsave(); - - /* Get the current time then sleep for the requested time. - * sigtimedwait() cannot succeed. It should always return error with - * either (1) EAGAIN meaning that the timeout occurred, or (2) EINTR - * meaning that some other unblocked signal was caught. - */ - - start = clock_systimer(); - (void)sigtimedwait(&set, &value, &ts); - - /* Calculate the elapsed time (in clock ticks) when we wake up from the sleep. - * This is really only necessary if we were awakened from the sleep early - * due to the receipt of a signal. - */ - - elapsed = clock_systimer() - start; - irqrestore(flags); - - /* Get the remaining, un-waited seconds. Note that this calculation - * truncates the elapsed seconds in the division. We may have slept some - * fraction of a second longer than this! But if the calculation is less - * than the 'seconds', we certainly did not sleep for the complete - * requested interval. - */ - - remaining = (int32_t)seconds - elapsed / TICK_PER_SEC; - - /* Make sure that the elapsed time is non-negative (this should always - * be the case unless something exceptional happened while were we - * sleeping -- like the clock was reset or we went into a low power mode, - * OR if we had to wait a long time to run again after calling - * sigtimedwait() making 'elapsed' bigger than it should have been). - */ - - if (remaining < 0) - { - remaining = 0; - } - } - - return (unsigned int)remaining; -} |