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11 * permit persons to whom the Software is furnished to do so, subject to
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14 * The above copyright notice and this permission notice (including the
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26 **************************************************************************/
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)
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)