/************************************************************************** * * 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 "os_time.h" /* TODO: fix this dependency */ #include "gallium/include/pipe/p_config.h" #include "util/u_atomic.h" #if defined(PIPE_OS_UNIX) # include <unistd.h> /* usleep */ # 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 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 == OS_TIMEOUT_INFINITE || timeout > INT64_MAX) return OS_TIMEOUT_INFINITE; time = os_time_get_nano(); abs_timeout = time + (int64_t)timeout; /* Check for overflow. */ if (abs_timeout < time) return OS_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 == OS_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 == OS_TIMEOUT_INFINITE) return os_wait_until_zero(var, OS_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; }