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30 * OS independent time-manipulation functions.
32 * @author Jose Fonseca <jfonseca@vmware.com>
37 /* TODO: fix this dependency */
38 #include "gallium/include/pipe/p_config.h"
40 #include "util/u_atomic.h"
42 #if defined(PIPE_OS_UNIX)
43 # include <unistd.h> /* usleep */
44 # include <time.h> /* timeval */
45 # include <sys/time.h> /* timeval */
46 # include <sched.h> /* sched_yield */
48 #elif defined(PIPE_SUBSYSTEM_WINDOWS_USER)
51 # error Unsupported OS
56 os_time_get_nano(void)
58 #if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD)
61 clock_gettime(CLOCK_MONOTONIC, &tv);
62 return tv.tv_nsec + tv.tv_sec*INT64_C(1000000000);
64 #elif defined(PIPE_OS_UNIX)
67 gettimeofday(&tv, NULL);
68 return tv.tv_usec*INT64_C(1000) + tv.tv_sec*INT64_C(1000000000);
70 #elif defined(PIPE_SUBSYSTEM_WINDOWS_USER)
72 static LARGE_INTEGER frequency;
73 LARGE_INTEGER counter;
74 int64_t secs, nanosecs;
75 if(!frequency.QuadPart)
76 QueryPerformanceFrequency(&frequency);
77 QueryPerformanceCounter(&counter);
78 /* Compute seconds and nanoseconds parts separately to
79 * reduce severity of precision loss.
81 secs = counter.QuadPart / frequency.QuadPart;
82 nanosecs = (counter.QuadPart % frequency.QuadPart) * INT64_C(1000000000)
84 return secs*INT64_C(1000000000) + nanosecs;
96 os_time_sleep(int64_t usecs)
98 #if defined(PIPE_OS_LINUX)
100 time.tv_sec = usecs / 1000000;
101 time.tv_nsec = (usecs % 1000000) * 1000;
102 while (clock_nanosleep(CLOCK_MONOTONIC, 0, &time, &time) == EINTR);
104 #elif defined(PIPE_OS_UNIX)
107 #elif defined(PIPE_SUBSYSTEM_WINDOWS_USER)
108 DWORD dwMilliseconds = (DWORD) ((usecs + 999) / 1000);
109 /* Avoid Sleep(O) as that would cause to sleep for an undetermined duration */
110 if (dwMilliseconds) {
111 Sleep(dwMilliseconds);
114 # error Unsupported OS
121 os_time_get_absolute_timeout(uint64_t timeout)
123 int64_t time, abs_timeout;
125 /* Also check for the type upper bound. */
126 if (timeout == OS_TIMEOUT_INFINITE || timeout > INT64_MAX)
127 return OS_TIMEOUT_INFINITE;
129 time = os_time_get_nano();
130 abs_timeout = time + (int64_t)timeout;
132 /* Check for overflow. */
133 if (abs_timeout < time)
134 return OS_TIMEOUT_INFINITE;
141 os_wait_until_zero(volatile int *var, uint64_t timeout)
143 if (!p_atomic_read(var))
149 if (timeout == OS_TIMEOUT_INFINITE) {
150 while (p_atomic_read(var)) {
151 #if defined(PIPE_OS_UNIX)
158 int64_t start_time = os_time_get_nano();
159 int64_t end_time = start_time + timeout;
161 while (p_atomic_read(var)) {
162 if (os_time_timeout(start_time, end_time, os_time_get_nano()))
165 #if defined(PIPE_OS_UNIX)
175 os_wait_until_zero_abs_timeout(volatile int *var, int64_t timeout)
177 if (!p_atomic_read(var))
180 if (timeout == OS_TIMEOUT_INFINITE)
181 return os_wait_until_zero(var, OS_TIMEOUT_INFINITE);
183 while (p_atomic_read(var)) {
184 if (os_time_get_nano() >= timeout)
187 #if defined(PIPE_OS_UNIX)