[common/client] platform: make timing waits portable

client/audiodevs/PulseAudio/pulseaudio.c

@@ -27,6 +27,7 @@
 
 #include "common/debug.h"
 #include "common/time.h"
+#include "common/util.h"
 
 #define PULSEAUDIO_ERROR_REPORT_INTERVAL_NS INT64_C(1000000000)
 #define PULSEAUDIO_OPERATION_TIMEOUT_US      UINT64_C(250000)

client/displayservers/Wayland/presentation.c

@@ -22,8 +22,9 @@
 #include "wayland.h"
 
 #include <stdbool.h>
-#include <string.h>
 #include <errno.h>
+#include <string.h>
+#include <time.h>
 
 #include <wayland-client.h>
 
@@ -68,11 +69,26 @@ static bool presentationOrdered(const struct timespec * left,
     (left->tv_sec == right->tv_sec && left->tv_nsec >= right->tv_nsec);
 }
 
+static struct timespec presentationTimespecDiff(
+    const struct timespec * left, const struct timespec * right)
+{
+  struct timespec result =
+  {
+    .tv_sec  = left->tv_sec  - right->tv_sec,
+    .tv_nsec = left->tv_nsec - right->tv_nsec,
+  };
+  if (result.tv_nsec < 0)
+  {
+    --result.tv_sec;
+    result.tv_nsec += 1000000000;
+  }
+  return result;
+}
+
 static uint64_t presentationDelta(const struct timespec * left,
     const struct timespec * right)
 {
-  struct timespec delta;
+  const struct timespec delta = presentationTimespecDiff(left, right);
-  tsDiff(&delta, left, right);
   return (uint64_t)delta.tv_sec * 1000000000ULL + delta.tv_nsec;
 }
 
@@ -132,8 +148,8 @@ static void presentationFeedbackPresented(void * opaque,
 
   if (tvNsec < 1000000000)
   {
-    struct timespec delta;
+    const struct timespec delta =
-    tsDiff(&delta, &present, &frame->sent);
+      presentationTimespecDiff(&present, &frame->sent);
     ringbuffer_push(wlWm.photonTimings,
         &(float){ delta.tv_sec * 1e3f + delta.tv_nsec * 1e-6f });
   }

client/displayservers/X11/x11.c

@@ -30,6 +30,7 @@
 #include "resources/no-input-cursor/32.xcur.h"
 
 #include <string.h>
+#include <time.h>
 #include <unistd.h>
 #include <sys/epoll.h>
 #include <errno.h>

client/src/main.c

@@ -893,10 +893,7 @@ static int cursorRepaintThread(void * unused)
       if (!waitTime)
         break;
 
-      struct timespec deadlineTime;
+      lgWaitEventDeadline(e_cursorRepaint, deadline);
-      clock_gettime(CLOCK_MONOTONIC, &deadlineTime);
-      tsAdd(&deadlineTime, waitTime);
-      lgWaitEventAbs(e_cursorRepaint, &deadlineTime);
     }
   }
 
@@ -941,8 +938,7 @@ static int renderThread(void * unused)
   /* signal to other threads that the renderer is ready */
   lgSignalEvent(e_startup);
 
-  struct timespec time;
+  uint64_t renderDeadline = nanotime();
-  clock_gettime(CLOCK_MONOTONIC, &time);
 
   while(likely(app_getState() != APP_STATE_SHUTDOWN))
   {
@@ -994,7 +990,7 @@ static int renderThread(void * unused)
     else if (g_params.fpsMin != 0)
     {
       app_handleRenderEvent(microtime());
-      lgWaitEventAbs(g_state.frameEvent, &time);
+      lgWaitEventDeadline(g_state.frameEvent, renderDeadline);
     }
 
     bool           cursorWake;
@@ -1112,8 +1108,7 @@ static int renderThread(void * unused)
     if (!g_state.jitRender && g_params.fpsMin != 0)
     {
       /* A frame-driven swap also satisfies the minimum render rate. */
-      clock_gettime(CLOCK_MONOTONIC, &time);
+      renderDeadline = nanotime() + (app_overlayNeedsRender() ?
-      tsAdd(&time, app_overlayNeedsRender() ?
           g_state.overlayFrameTime : g_state.frameTime);
     }
 

client/src/overlay/graphs.c

@@ -29,6 +29,7 @@
 #include "common/debug.h"
 #include "common/stringutils.h"
 #include "common/time.h"
+#include "common/util.h"
 #include "overlay_utils.h"
 
 #include <math.h>

client/src/render_queue.c

@@ -28,6 +28,7 @@
 
 #include "common/debug.h"
 #include "common/locking.h"
+#include "common/util.h"
 #include "main.h"
 
 typedef struct RenderCommand

client/src/usb_audio.c

@@ -24,6 +24,7 @@
 #include "common/event.h"
 #include "common/ringbuffer.h"
 #include "common/time.h"
+#include "common/util.h"
 
 #include <usbredirparser.h>
 

client/tests/CMakeLists.txt

@@ -1,5 +1,19 @@
 cmake_minimum_required(VERSION 3.10)
 
+add_executable(common-platform-tests
+  common_platform_test.c
+)
+target_link_libraries(common-platform-tests
+  ${EXE_FLAGS}
+  lg_common
+)
+add_test(NAME common-platform-tests
+  COMMAND common-platform-tests
+)
+set_tests_properties(common-platform-tests PROPERTIES
+  TIMEOUT 10
+)
+
 add_executable(font-tests
   font_test.c
   ../src/font.c

client/tests/common_platform_test.c

@@ -0,0 +1,117 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2026 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "test.h"
+
+#include "common/event.h"
+#include "common/thread.h"
+#include "common/time.h"
+
+#include <stdatomic.h>
+#include <stdint.h>
+
+#define TEST_WAIT_NS UINT64_C(1000000000)
+
+struct SignalState
+{
+  LGEvent * event;
+};
+
+struct TimerState
+{
+  LGEvent    * event;
+  atomic_uint  calls;
+};
+
+static int signalThread(void * opaque)
+{
+  const struct SignalState * state = opaque;
+  nsleep(UINT64_C(2000000));
+  CHECK(lgSignalEvent(state->event));
+  return 0;
+}
+
+static bool timerCallback(void * opaque)
+{
+  struct TimerState * state = opaque;
+  const unsigned int calls = atomic_fetch_add_explicit(
+      &state->calls, 1, memory_order_relaxed) + 1;
+  if (calls < 2)
+    return true;
+
+  CHECK(lgSignalEvent(state->event));
+  return false;
+}
+
+static void testEventWaits(void)
+{
+  LGEvent * event = lgCreateEvent(true, 0);
+  CHECK(event);
+
+  const uint64_t timeoutStart = nanotime();
+  CHECK(!lgWaitEventNS(event, UINT64_C(1000000)));
+  CHECK(nanotime() >= timeoutStart);
+
+  const struct SignalState state = { .event = event };
+  LGThread * thread;
+  CHECK(lgCreateThread("eventSignal", signalThread, (void *)&state, &thread));
+  CHECK(lgWaitEventDeadline(event, nanotime() + TEST_WAIT_NS));
+  CHECK(lgJoinThread(thread, NULL));
+
+  CHECK(!lgWaitEvent(event, 0));
+  lgFreeEvent(event);
+}
+
+static void testManualReset(void)
+{
+  LGEvent * event = lgCreateEvent(false, 0);
+  CHECK(event);
+  CHECK(lgSignalEvent(event));
+  CHECK(lgWaitEvent(event, 0));
+  CHECK(lgWaitEvent(event, 0));
+  CHECK(lgResetEvent(event));
+  CHECK(!lgWaitEvent(event, 0));
+  lgFreeEvent(event);
+}
+
+static void testTimer(void)
+{
+  LGEvent * event = lgCreateEvent(true, 0);
+  CHECK(event);
+
+  struct TimerState state = { .event = event };
+  atomic_init(&state.calls, 0);
+
+  LGTimer * timer;
+  CHECK(lgCreateTimer(1, timerCallback, &state, &timer));
+  CHECK(lgWaitEventNS(event, TEST_WAIT_NS));
+  lgTimerDestroy(timer);
+  CHECK(atomic_load_explicit(&state.calls, memory_order_relaxed) == 2);
+  lgFreeEvent(event);
+}
+
+int main(void)
+{
+  lgTimeInit();
+  testEventWaits();
+  testManualReset();
+  testTimer();
+  return 0;
+}

client/transports/SPICE/session.c

@@ -22,6 +22,7 @@
 
 #include "common/debug.h"
 #include "common/time.h"
+#include "common/util.h"
 
 #include <purespice.h>
 

common/include/common/event.h

@@ -22,9 +22,10 @@
 #define _H_LG_COMMON_EVENT_
 
 #include <stdbool.h>
-#include <time.h>
+#include <stdint.h>
 
 #define TIMEOUT_INFINITE ((unsigned int)~0)
+#define TIMEOUT_INFINITE_NS UINT64_MAX
 
 typedef struct LGEvent LGEvent;
 
@@ -38,8 +39,7 @@ bool      lgResetEvent (LGEvent * handle);
 // for windows this is an event HANDLE
 LGEvent * lgWrapEvent(void * handle);
 
-// Posix specific, not implmented/possible in windows
+bool lgWaitEventDeadline(LGEvent * handle, uint64_t deadlineNs);
-bool lgWaitEventAbs(LGEvent * handle, struct timespec * ts);
+bool lgWaitEventNS      (LGEvent * handle, uint64_t timeoutNs);
-bool lgWaitEventNS (LGEvent * handle, unsigned int timeout);
 
 #endif

common/include/common/time.h

@@ -20,120 +20,15 @@
 
 #pragma once
 
-#include <stdint.h>
 #include <stdbool.h>
-#include <time.h>
+#include <stdint.h>
-#include "common/util.h"
-
-#if defined(_WIN32)
-#include <windows.h>
-
-void windowsSetTimerResolution(void);
-NTSYSCALLAPI NTSTATUS NTAPI NtDelayExecution(
-  _In_ BOOLEAN Alertable,
-  _In_opt_ PLARGE_INTEGER DelayInterval
-);
-#endif
 
 typedef struct LGTimer LGTimer;
 
-static inline uint64_t microtime(void)
+void     lgTimeInit(void);
-{
+uint64_t microtime (void);
-#if defined(_WIN32)
+uint64_t nanotime  (void);
-  static unsigned long div = 0;
+void     nsleep    (uint64_t ns);
-  if (unlikely(div == 0))
-  {
-    LARGE_INTEGER freq = { .QuadPart = 0LL };
-    QueryPerformanceFrequency(&freq);
-    div = freq.QuadPart / 1000000LL;
-    if(div == 0)
-      abort();
-  }
-
-  LARGE_INTEGER time;
-  QueryPerformanceCounter(&time);
-  return time.QuadPart / div;
-#else
-  struct timespec time;
-  clock_gettime(CLOCK_MONOTONIC, &time);
-  return (uint64_t)time.tv_sec * 1000000LL + time.tv_nsec / 1000LL;
-#endif
-}
-
-static inline void nsleep(uint64_t ns)
-{
-#if defined(_WIN32)
-  LARGE_INTEGER interval = { .QuadPart = -(int64_t)(ns / 100LL) };
-  NtDelayExecution(FALSE, &interval);
-#else
-  const struct timespec ts =
-  {
-    .tv_sec  = ns / 1000000000,
-    .tv_nsec = ns % 1000000000,
-  };
-  nanosleep(&ts, NULL);
-#endif
-}
-
-static inline uint64_t nanotime(void)
-{
-#if defined(_WIN32)
-  static double multiplier = 0.0;
-  if (unlikely(!multiplier))
-  {
-    LARGE_INTEGER freq = { .QuadPart = 0LL };
-    QueryPerformanceFrequency(&freq);
-    if (freq.QuadPart == 0)
-      abort();
-
-    multiplier = 1e9 / freq.QuadPart;
-  }
-
-  LARGE_INTEGER time;
-  QueryPerformanceCounter(&time);
-  return (uint64_t) (time.QuadPart * multiplier);
-#else
-  struct timespec time;
-  clock_gettime(CLOCK_MONOTONIC_RAW, &time);
-  return ((uint64_t)time.tv_sec * 1000000000LL) + time.tv_nsec;
-#endif
-}
-
-static inline void tsDiff(struct timespec *diff, const struct timespec *left,
-              const struct timespec *right)
-{
-  diff->tv_sec = left->tv_sec - right->tv_sec;
-  diff->tv_nsec = left->tv_nsec - right->tv_nsec;
-  if (diff->tv_nsec < 0)
-  {
-    --diff->tv_sec;
-    diff->tv_nsec += 1000000000;
-  }
-}
-
-static inline uint32_t __iter_div_u64_rem(uint64_t dividend, uint32_t divisor, uint64_t *remainder)
-{
-  uint32_t ret = 0;
-
-  while (dividend >= divisor) {
-    /* The following asm() prevents the compiler from
-       optimising this loop into a modulo operation.  */
-    asm("" : "+rm"(dividend));
-
-    dividend -= divisor;
-    ret++;
-  }
-
-  *remainder = dividend;
-
-  return ret;
-}
-
-static inline void tsAdd(struct timespec *a, uint64_t ns)
-{
-  a->tv_sec  += __iter_div_u64_rem(a->tv_nsec + ns, 1000000000L, &ns);
-  a->tv_nsec = ns;
-}
 
 typedef bool (*LGTimerFn)(void * udata);
 

common/src/platform/linux/event.c

@@ -21,6 +21,7 @@
 #include "common/event.h"
 
 #include "common/debug.h"
+#include "common/time.h"
 
 #include <stdlib.h>
 #include <pthread.h>
@@ -87,7 +88,7 @@ void lgFreeEvent(LGEvent * handle)
   free(handle);
 }
 
-bool lgWaitEventAbs(LGEvent * handle, struct timespec * ts)
+static bool waitEventAbs(LGEvent * handle, const struct timespec * ts)
 {
   DEBUG_ASSERT(handle);
 
@@ -143,32 +144,38 @@ bool lgWaitEventAbs(LGEvent * handle, struct timespec * ts)
   return ret;
 }
 
-static bool waitEventNS(LGEvent * handle, uint64_t timeout)
+bool lgWaitEventDeadline(LGEvent * handle, uint64_t deadlineNs)
 {
-  struct timespec ts;
+  if (deadlineNs == TIMEOUT_INFINITE_NS)
-  clock_gettime(CLOCK_MONOTONIC, &ts);
+    return waitEventAbs(handle, NULL);
 
-  const uint64_t nsec = (uint64_t)ts.tv_nsec + timeout;
+  const struct timespec ts =
-  ts.tv_sec += nsec / 1000000000ULL;
+  {
-  ts.tv_nsec = nsec % 1000000000ULL;
+    .tv_sec  = deadlineNs / UINT64_C(1000000000),
-
+    .tv_nsec = deadlineNs % UINT64_C(1000000000),
-  return lgWaitEventAbs(handle, &ts);
+  };
+  return waitEventAbs(handle, &ts);
 }
 
-bool lgWaitEventNS(LGEvent * handle, unsigned int timeout)
+bool lgWaitEventNS(LGEvent * handle, uint64_t timeoutNs)
 {
-  if (timeout == TIMEOUT_INFINITE)
+  if (timeoutNs == TIMEOUT_INFINITE_NS)
-    return lgWaitEventAbs(handle, NULL);
+    return waitEventAbs(handle, NULL);
 
-  return waitEventNS(handle, timeout);
+  const uint64_t now = nanotime();
+  if (UINT64_MAX - now < timeoutNs)
+    return waitEventAbs(handle, NULL);
+
+  return lgWaitEventDeadline(handle, now + timeoutNs);
 }
 
 bool lgWaitEvent(LGEvent * handle, unsigned int timeout)
 {
   if (timeout == TIMEOUT_INFINITE)
-    return lgWaitEventAbs(handle, NULL);
+    return waitEventAbs(handle, NULL);
 
-  return waitEventNS(handle, (uint64_t)timeout * 1000000ULL);
+  return lgWaitEventNS(handle,
+      (uint64_t)timeout * UINT64_C(1000000));
 }
 
 bool lgSignalEvent(LGEvent * handle)

common/src/platform/linux/time.c

@@ -46,6 +46,44 @@ struct LGTimer
 
 static struct LGTimerState l_ts = { 0 };
 
+void lgTimeInit(void)
+{
+}
+
+uint64_t microtime(void)
+{
+  struct timespec time;
+  clock_gettime(CLOCK_MONOTONIC, &time);
+  return (uint64_t)time.tv_sec * UINT64_C(1000000) +
+    (uint64_t)time.tv_nsec / UINT64_C(1000);
+}
+
+uint64_t nanotime(void)
+{
+  struct timespec time;
+  clock_gettime(CLOCK_MONOTONIC, &time);
+  return (uint64_t)time.tv_sec * UINT64_C(1000000000) +
+    (uint64_t)time.tv_nsec;
+}
+
+void nsleep(uint64_t ns)
+{
+  struct timespec remaining =
+  {
+    .tv_sec  = ns / UINT64_C(1000000000),
+    .tv_nsec = ns % UINT64_C(1000000000),
+  };
+
+  while (nanosleep(&remaining, &remaining) != 0 && errno == EINTR) {}
+}
+
+static void timespecAdd(struct timespec * time, uint64_t ns)
+{
+  const uint64_t nsec = (uint64_t)time->tv_nsec + ns;
+  time->tv_sec  += nsec / UINT64_C(1000000000);
+  time->tv_nsec  = nsec % UINT64_C(1000000000);
+}
+
 static int timerFn(void * fn)
 {
   struct LGTimer * timer;
@@ -67,7 +105,7 @@ static int timerFn(void * fn)
     }
     ll_unlock(l_ts.timers);
 
-    tsAdd(&time, 1000000);
+    timespecAdd(&time, UINT64_C(1000000));
     while(clock_nanosleep(CLOCK_MONOTONIC, TIMER_ABSTIME, &time, NULL) != 0) {}
   }
 

common/src/platform/windows/event.c

@@ -27,6 +27,8 @@
 
 LGEvent * lgCreateEvent(bool autoReset, unsigned int msSpinTime)
 {
+  (void)msSpinTime;
+
   HANDLE handle = CreateEvent(NULL, autoReset ? FALSE : TRUE, FALSE, NULL);
   if (!handle)
   {
@@ -77,6 +79,30 @@ bool lgWaitEvent(LGEvent * event, unsigned int timeout)
   while(true);
 }
 
+bool lgWaitEventNS(LGEvent * event, uint64_t timeoutNs)
+{
+  if (timeoutNs == TIMEOUT_INFINITE_NS)
+    return lgWaitEvent(event, TIMEOUT_INFINITE);
+
+  const uint64_t timeoutMs = timeoutNs / UINT64_C(1000000) +
+    (timeoutNs % UINT64_C(1000000) != 0);
+  return lgWaitEvent(event,
+      timeoutMs >= TIMEOUT_INFINITE ? TIMEOUT_INFINITE - 1U :
+      (unsigned int)timeoutMs);
+}
+
+bool lgWaitEventDeadline(LGEvent * event, uint64_t deadlineNs)
+{
+  if (deadlineNs == TIMEOUT_INFINITE_NS)
+    return lgWaitEvent(event, TIMEOUT_INFINITE);
+
+  const uint64_t now = nanotime();
+  if (deadlineNs <= now)
+    return lgWaitEvent(event, 0);
+
+  return lgWaitEventNS(event, deadlineNs - now);
+}
+
 bool lgSignalEvent(LGEvent * event)
 {
   return SetEvent((HANDLE)event);

common/src/platform/windows/time.c

@@ -20,28 +20,92 @@
 
 #include "common/time.h"
 #include "common/debug.h"
+#include "common/windebug.h"
 
-// decared by the platform
+#include <stdatomic.h>
-extern HWND MessageHWND;
+#include <stdlib.h>
+#include <windows.h>
+
+NTSYSCALLAPI NTSTATUS NTAPI NtDelayExecution(
+  _In_ BOOLEAN Alertable,
+  _In_opt_ PLARGE_INTEGER DelayInterval
+);
 
 struct LGTimer
 {
   LGTimerFn   fn;
   void      * udata;
-  UINT_PTR    handle;
+  HANDLE      handle;
-  bool        running;
+  atomic_bool running;
 };
 
-static void TimerProc(HWND Arg1, UINT Arg2, UINT_PTR Arg3, DWORD Arg4)
+static uint64_t performanceFrequency(void)
 {
-  LGTimer * timer = (LGTimer *)Arg3;
+  static atomic_uint_fast64_t cached;
+
+  uint64_t result = atomic_load_explicit(&cached, memory_order_acquire);
+  if (result)
+    return result;
+
+  LARGE_INTEGER value;
+  if (!QueryPerformanceFrequency(&value) || value.QuadPart <= 0)
+    abort();
+
+  result = value.QuadPart;
+  atomic_store_explicit(&cached, result, memory_order_release);
+  return result;
+}
+
+static VOID CALLBACK timerProc(PVOID opaque, BOOLEAN fired)
+{
+  (void)fired;
+
+  LGTimer * timer = opaque;
+  if (!atomic_load_explicit(&timer->running, memory_order_acquire))
+    return;
+
   if (!timer->fn(timer->udata))
   {
-    KillTimer(Arg1, timer->handle);
+    atomic_store_explicit(&timer->running, false, memory_order_release);
-    timer->running = false;
+    if (!ChangeTimerQueueTimer(NULL, timer->handle, INFINITE, 0))
+      DEBUG_WINERROR("Failed to stop timer", GetLastError());
   }
 }
 
+uint64_t microtime(void)
+{
+  LARGE_INTEGER value;
+  QueryPerformanceCounter(&value);
+  const uint64_t frequency = performanceFrequency();
+  const uint64_t seconds   = (uint64_t)value.QuadPart / frequency;
+  const uint64_t ticks     = (uint64_t)value.QuadPart % frequency;
+  return seconds * UINT64_C(1000000) +
+    ticks * UINT64_C(1000000) / frequency;
+}
+
+uint64_t nanotime(void)
+{
+  LARGE_INTEGER value;
+  QueryPerformanceCounter(&value);
+  const uint64_t frequency = performanceFrequency();
+  const uint64_t seconds   = (uint64_t)value.QuadPart / frequency;
+  const uint64_t ticks     = (uint64_t)value.QuadPart % frequency;
+  return seconds * UINT64_C(1000000000) +
+    ticks * UINT64_C(1000000000) / frequency;
+}
+
+void nsleep(uint64_t ns)
+{
+  if (!ns)
+    return;
+
+  LARGE_INTEGER interval =
+  {
+    .QuadPart = -(int64_t)((ns + UINT64_C(99)) / UINT64_C(100)),
+  };
+  NtDelayExecution(FALSE, &interval);
+}
+
 bool lgCreateTimer(const unsigned int intervalMS, LGTimerFn fn,
     void * udata, LGTimer ** result)
 {
@@ -52,10 +116,18 @@ bool lgCreateTimer(const unsigned int intervalMS, LGTimerFn fn,
     return false;
   }
 
-  ret->fn      = fn;
+  ret->fn     = fn;
-  ret->udata   = udata;
+  ret->udata  = udata;
-  ret->running = true;
+  ret->handle = NULL;
-  ret->handle  = SetTimer(MessageHWND, (UINT_PTR)ret, intervalMS, TimerProc);
+  atomic_init(&ret->running, true);
+
+  if (!CreateTimerQueueTimer(&ret->handle, NULL, timerProc, ret,
+        intervalMS, intervalMS, WT_EXECUTEDEFAULT))
+  {
+    DEBUG_WINERROR("Failed to create timer", GetLastError());
+    free(ret);
+    return false;
+  }
 
   *result = ret;
   return true;
@@ -63,10 +135,13 @@ bool lgCreateTimer(const unsigned int intervalMS, LGTimerFn fn,
 
 void lgTimerDestroy(LGTimer * timer)
 {
-  if (timer->running)
+  atomic_store_explicit(&timer->running, false, memory_order_release);
+  if (timer->handle &&
+      !DeleteTimerQueueTimer(NULL, timer->handle, INVALID_HANDLE_VALUE))
   {
-    if (MessageHWND && !KillTimer(MessageHWND, timer->handle))
+    const DWORD error = GetLastError();
-      DEBUG_ERROR("failed to destroy the timer");
+    if (error != ERROR_IO_PENDING)
+      DEBUG_WINERROR("Failed to destroy timer", error);
   }
 
   free(timer);
@@ -78,7 +153,7 @@ NTSYSCALLAPI NTSTATUS NTAPI NtSetTimerResolution(
   _Out_ PULONG ActualTime
 );
 
-void windowsSetTimerResolution(void)
+void lgTimeInit(void)
 {
   ULONG actualResolution;
   NtSetTimerResolution(1, true, &actualResolution);

host/platform/Windows/src/platform.c

@@ -615,7 +615,7 @@ bool app_init(void)
   if (ods && !ods_start())
     DEBUG_WARN("Failed to setup capture of debug messages");
 
-  windowsSetTimerResolution();
+  lgTimeInit();
 
   // get the performance frequency for spinlocks
   QueryPerformanceFrequency(&app.perfFreq);

host/src/app.c

@@ -44,6 +44,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 #include <math.h>
 
 #define CONFIG_FILE "looking-glass-host.ini"