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C: improve resolution of System.currentTimeNano in Windows

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This commit is contained in:
Alexey Andreev 2019-07-08 14:13:56 +03:00
parent 8667b98af5
commit 4fa3db38a0
1 changed files with 13 additions and 8 deletions
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21
core/src/main/resources/org/teavm/backend/c/runtime.c
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@ -59,6 +59,8 @@ static timer_t teavm_queueTimer;
#ifdef _MSC_VER
static HANDLE teavm_queueTimer;
int64_t teavm_unixTimeOffset;
int64_t teavm_perfFrequency, teavm_perfInitTime;
#endif
void teavm_beforeInit() {
@ -84,6 +86,12 @@ void teavm_beforeInit() {
#endif
#ifdef _MSC_VER
LARGE_INTEGER perf = { .QuadPart = 0 };
QueryPerformanceFrequency(&perf);
teavm_perfFrequency = perf.QuadPart;
QueryPerformanceCounter(&perf);
teavm_perfInitTime = perf.QuadPart;
teavm_queueTimer = CreateEvent(NULL, TRUE, FALSE, TEXT("TeaVM_eventQueue"));
SYSTEMTIME unixEpochStart = {
@ -185,8 +193,6 @@ void teavm_initHeap(int64_t heapSize) {
teavm_gc_availableBytes = heapSize;
}
int64_t teavm_unixTimeOffset;
int64_t teavm_currentTimeMillis() {
SYSTEMTIME time;
FILETIME fileTime;
@ -195,13 +201,12 @@ int64_t teavm_currentTimeMillis() {
uint64_t current = fileTime.dwLowDateTime | ((uint64_t) fileTime.dwHighDateTime << 32);
return (int64_t) ((current - teavm_unixTimeOffset) / 10000);
}
int64_t teavm_currentTimeNano() {
SYSTEMTIME time;
FILETIME fileTime;
GetSystemTime(&time);
SystemTimeToFileTime(&time, &fileTime);
uint64_t current = fileTime.dwLowDateTime | ((uint64_t) fileTime.dwHighDateTime << 32);
return (int64_t) ((current - teavm_unixTimeOffset) * 100);
LARGE_INTEGER perf = { .QuadPart = 0 };
QueryPerformanceCounter(&perf);
int64_t dt = perf.QuadPart - teavm_perfInitTime;
return dt * INT64_C(1000000000) / teavm_perfFrequency;
}
#endif