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/**************************************************************************
*
* Copyright 2008-2010 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/**
* @file
* OS independent time-manipulation functions.
*
* @author Jose Fonseca <jfonseca@vmware.com>
*/
#include "pipe/p_defines.h"
#include "util/u_atomic.h"
#if defined(PIPE_OS_UNIX)
# include <time.h> /* timeval */
# include <sys/time.h> /* timeval */
# include <sched.h> /* sched_yield */
# include <errno.h>
#elif defined(PIPE_SUBSYSTEM_WINDOWS_USER)
# include <windows.h>
#else
# error Unsupported OS
#endif
#include "os_time.h"
int64_t
os_time_get_nano(void)
{
#if defined(PIPE_OS_LINUX)
struct timespec tv;
clock_gettime(CLOCK_MONOTONIC, &tv);
return tv.tv_nsec + tv.tv_sec*INT64_C(1000000000);
#elif defined(PIPE_OS_UNIX)
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_usec*INT64_C(1000) + tv.tv_sec*INT64_C(1000000000);
#elif defined(PIPE_SUBSYSTEM_WINDOWS_USER)
static LARGE_INTEGER frequency;
LARGE_INTEGER counter;
int64_t secs, nanosecs;
if(!frequency.QuadPart)
QueryPerformanceFrequency(&frequency);
QueryPerformanceCounter(&counter);
/* Compute seconds and nanoseconds parts separately to
* reduce severity of precision loss.
*/
secs = counter.QuadPart / frequency.QuadPart;
nanosecs = (counter.QuadPart % frequency.QuadPart) * INT64_C(1000000000)
/ frequency.QuadPart;
return secs*INT64_C(1000000000) + nanosecs;
#else
#error Unsupported OS
#endif
}
void
os_time_sleep(int64_t usecs)
{
#if defined(PIPE_OS_LINUX)
struct timespec time;
time.tv_sec = usecs / 1000000;
time.tv_nsec = (usecs % 1000000) * 1000;
while (clock_nanosleep(CLOCK_MONOTONIC, 0, &time, &time) == EINTR);
#elif defined(PIPE_OS_UNIX)
usleep(usecs);
#elif defined(PIPE_SUBSYSTEM_WINDOWS_USER)
DWORD dwMilliseconds = (DWORD) ((usecs + 999) / 1000);
/* Avoid Sleep(O) as that would cause to sleep for an undetermined duration */
if (dwMilliseconds) {
Sleep(dwMilliseconds);
}
#else
# error Unsupported OS
#endif
}
int64_t
os_time_get_absolute_timeout(uint64_t timeout)
{
int64_t time, abs_timeout;
/* Also check for the type upper bound. */
if (timeout == PIPE_TIMEOUT_INFINITE || timeout > INT64_MAX)
return PIPE_TIMEOUT_INFINITE;
time = os_time_get_nano();
abs_timeout = time + (int64_t)timeout;
/* Check for overflow. */
if (abs_timeout < time)
return PIPE_TIMEOUT_INFINITE;
return abs_timeout;
}
bool
os_wait_until_zero(volatile int *var, uint64_t timeout)
{
if (!p_atomic_read(var))
return true;
if (!timeout)
return false;
if (timeout == PIPE_TIMEOUT_INFINITE) {
while (p_atomic_read(var)) {
#if defined(PIPE_OS_UNIX)
sched_yield();
#endif
}
return true;
}
else {
int64_t start_time = os_time_get_nano();
int64_t end_time = start_time + timeout;
while (p_atomic_read(var)) {
if (os_time_timeout(start_time, end_time, os_time_get_nano()))
return false;
#if defined(PIPE_OS_UNIX)
sched_yield();
#endif
}
return true;
}
}
bool
os_wait_until_zero_abs_timeout(volatile int *var, int64_t timeout)
{
if (!p_atomic_read(var))
return true;
if (timeout == PIPE_TIMEOUT_INFINITE)
return os_wait_until_zero(var, PIPE_TIMEOUT_INFINITE);
while (p_atomic_read(var)) {
if (os_time_get_nano() >= timeout)
return false;
#if defined(PIPE_OS_UNIX)
sched_yield();
#endif
}
return true;
}
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