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