src/gallium/auxiliary/os/os_time.c

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  27
  28 /**
  29  * @file
  30  * OS independent time-manipulation functions.
  31  *
  32  * @author Jose Fonseca <jfonseca@vmware.com>
  33  */
  34
  35
  36 #include "pipe/p_defines.h"
  37 #include "util/u_atomic.h"
  38
  39 #if defined(PIPE_OS_UNIX)
  40 #  include <time.h> /* timeval */
  41 #  include <sys/time.h> /* timeval */
  42 #  include <sched.h> /* sched_yield */
  43 #  include <errno.h>
  44 #elif defined(PIPE_SUBSYSTEM_WINDOWS_USER)
  45 #  include <windows.h>
  46 #else
  47 #  error Unsupported OS
  48 #endif
  49
  50 #include "os_time.h"
  51
  52
  53 int64_t
  54 os_time_get_nano(void)
  55 {
  56 #if defined(PIPE_OS_LINUX)
  57
  58    struct timespec tv;
  59    clock_gettime(CLOCK_MONOTONIC, &tv);
  60    return tv.tv_nsec + tv.tv_sec*INT64_C(1000000000);
  61
  62 #elif defined(PIPE_OS_UNIX)
  63
  64    struct timeval tv;
  65    gettimeofday(&tv, NULL);
  66    return tv.tv_usec*INT64_C(1000) + tv.tv_sec*INT64_C(1000000000);
  67
  68 #elif defined(PIPE_SUBSYSTEM_WINDOWS_USER)
  69
  70    static LARGE_INTEGER frequency;
  71    LARGE_INTEGER counter;
  72    if(!frequency.QuadPart)
  73       QueryPerformanceFrequency(&frequency);
  74    QueryPerformanceCounter(&counter);
  75    return counter.QuadPart*INT64_C(1000000000)/frequency.QuadPart;
  76
  77 #else
  78
  79 #error Unsupported OS
  80
  81 #endif
  82 }
  83
  84
  85
  86 void
  87 os_time_sleep(int64_t usecs)
  88 {
  89 #if defined(PIPE_OS_LINUX)
  90    struct timespec time;
  91    time.tv_sec = usecs / 1000000;
  92    time.tv_nsec = (usecs % 1000000) * 1000;
  93    while (clock_nanosleep(CLOCK_MONOTONIC, 0, &time, &time) == EINTR);
  94
  95 #elif defined(PIPE_OS_UNIX)
  96    usleep(usecs);
  97
  98 #elif defined(PIPE_SUBSYSTEM_WINDOWS_USER)
  99    DWORD dwMilliseconds = (DWORD) ((usecs + 999) / 1000);
 100    /* Avoid Sleep(O) as that would cause to sleep for an undetermined duration */
 101    if (dwMilliseconds) {
 102       Sleep(dwMilliseconds);
 103    }
 104 #else
 105 #  error Unsupported OS
 106 #endif
 107 }
 108
 109
 110
 111 int64_t
 112 os_time_get_absolute_timeout(uint64_t timeout)
 113 {
 114    int64_t time, abs_timeout;
 115
 116    /* Also check for the type upper bound. */
 117    if (timeout == PIPE_TIMEOUT_INFINITE || timeout > INT64_MAX)
 118       return PIPE_TIMEOUT_INFINITE;
 119
 120    time = os_time_get_nano();
 121    abs_timeout = time + (int64_t)timeout;
 122
 123    /* Check for overflow. */
 124    if (abs_timeout < time)
 125       return PIPE_TIMEOUT_INFINITE;
 126
 127    return abs_timeout;
 128 }
 129
 130
 131 bool
 132 os_wait_until_zero(volatile int *var, uint64_t timeout)
 133 {
 134    if (!p_atomic_read(var))
 135       return true;
 136
 137    if (!timeout)
 138       return false;
 139
 140    if (timeout == PIPE_TIMEOUT_INFINITE) {
 141       while (p_atomic_read(var)) {
 142 #if defined(PIPE_OS_UNIX)
 143          sched_yield();
 144 #endif
 145       }
 146       return true;
 147    }
 148    else {
 149       int64_t start_time = os_time_get_nano();
 150       int64_t end_time = start_time + timeout;
 151
 152       while (p_atomic_read(var)) {
 153          if (os_time_timeout(start_time, end_time, os_time_get_nano()))
 154             return false;
 155
 156 #if defined(PIPE_OS_UNIX)
 157          sched_yield();
 158 #endif
 159       }
 160       return true;
 161    }
 162 }
 163
 164
 165 bool
 166 os_wait_until_zero_abs_timeout(volatile int *var, int64_t timeout)
 167 {
 168    if (!p_atomic_read(var))
 169       return true;
 170
 171    if (timeout == PIPE_TIMEOUT_INFINITE)
 172       return os_wait_until_zero(var, PIPE_TIMEOUT_INFINITE);
 173
 174    while (p_atomic_read(var)) {
 175       if (os_time_get_nano() >= timeout)
 176          return false;
 177
 178 #if defined(PIPE_OS_UNIX)
 179       sched_yield();
 180 #endif
 181    }
 182    return true;
 183 }