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Windows: implement uv_hrtime()

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This commit is contained in:
Bert Belder 2011-07-19 14:56:23 +02:00
parent 3d2d97dbae
commit 86f1ca90e5
2 changed files with 39 additions and 3 deletions
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1
src/win/error.c
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@ -107,6 +107,7 @@ uv_err_code uv_translate_sys_error(int sys_errno) {
case ERROR_TOO_MANY_OPEN_FILES: return UV_EMFILE;
case WSAEMFILE: return UV_EMFILE;
case ERROR_OUTOFMEMORY: return UV_ENOMEM;
case ERROR_NOT_SUPPORTED: return UV_ENOTSUP;
case ERROR_INSUFFICIENT_BUFFER: return UV_EINVAL;
case ERROR_INVALID_FLAGS: return UV_EBADF;
case ERROR_INVALID_PARAMETER: return UV_EINVAL;

41
src/win/timer.c
View File

@ -26,10 +26,14 @@
#include "internal.h"
#include "tree.h"
#undef NANOSEC
#define NANOSEC 1000000000
/* The resolution of the high-resolution clock. */
static int64_t uv_ticks_per_msec_ = 0;
static uint64_t uv_hrtime_frequency_ = 0;
static char uv_hrtime_initialized_ = 0;
void uv_update_time() {
@ -48,8 +52,39 @@ int64_t uv_now() {
uint64_t uv_hrtime(void) {
assert(0 && "implement me");
return 0;
LARGE_INTEGER counter;
/* When called for the first time, obtain the high-resolution clock */
/* frequency. */
if (!uv_hrtime_initialized_) {
uv_hrtime_initialized_ = 1;
if (!QueryPerformanceFrequency(&counter)) {
uv_hrtime_frequency_ = 0;
uv_set_sys_error(GetLastError());
return 0;
}
uv_hrtime_frequency_ = counter.QuadPart;
}
/* If the performance frequency is zero, there's no support. */
if (!uv_hrtime_frequency_) {
uv_set_sys_error(ERROR_NOT_SUPPORTED);
return 0;
}
if (!QueryPerformanceCounter(&counter)) {
uv_set_sys_error(GetLastError());
return 0;
}
/* Because we have no guarantee about the order of magniture of the */
/* performance counter frequency, and there may not be much headroom to */
/* multiply by NANOSEC without overflowing, we use 128-bit math instead. */
return ((uint64_t) counter.LowPart * NANOSEC / uv_hrtime_frequency_) +
(((uint64_t) counter.HighPart * NANOSEC / uv_hrtime_frequency_)
<< 32);
}