From 9fb3646511998310fc8c967c239803f38b2bdc5b Mon Sep 17 00:00:00 2001
From: Andrew Opalach <andrew@akon.city>
Date: Sun, 25 May 2025 18:35:12 -0400
Subject: Windows XP support

Signed-off-by: Andrew Opalach <andrew@akon.city>
---
 src/util/file/file_stdio.c       |  2 +-
 src/util/thread/thread.h         |  4 +++
 src/util/thread/thread_windows.c | 59 ++++++++++++++++++++++++++++++++++++++++
 src/util/timer/timer_windows.c   | 17 +++++++++---
 src/winwrap.h                    |  1 +
 5 files changed, 78 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/util/file/file_stdio.c b/src/util/file/file_stdio.c
index ae07908..97dd0f0 100644
--- a/src/util/file/file_stdio.c
+++ b/src/util/file/file_stdio.c
@@ -17,7 +17,7 @@ AL_ASSERT_TYPE_SIZE(off_t, 8);
 static inline bool open_stdio_file(FILE **file, str *path, const char *mode)
 {
     char *c_str = al_str_to_c_str(path);
-#ifdef NAUNET_ON_WINDOWS
+#if defined NAUNET_ON_WINDOWS && !defined NAUNET_WIN32_COMPAT_MODE
     // Still sets errno, according to the Microsoft docs.
     errno_t ret = fopen_s(file, c_str, mode);
 #else
diff --git a/src/util/thread/thread.h b/src/util/thread/thread.h
index 6ea5722..142aa3c 100644
--- a/src/util/thread/thread.h
+++ b/src/util/thread/thread.h
@@ -47,7 +47,11 @@ struct nn_mutex {
 
 struct nn_cond {
 #ifdef NAUNET_ON_WINDOWS
+#ifdef NAUNET_WIN32_COMPAT_MODE
+    HANDLE event;
+#else
     CONDITION_VARIABLE cond;
+#endif
 #else
     pthread_cond_t cond;
 #endif
diff --git a/src/util/thread/thread_windows.c b/src/util/thread/thread_windows.c
index 9ce85e2..8722d0a 100644
--- a/src/util/thread/thread_windows.c
+++ b/src/util/thread/thread_windows.c
@@ -1,3 +1,5 @@
+#include <al/lib.h>
+
 #include "thread.h"
 
 NTSTATUS(__stdcall *NtDelayExecution)(BOOL Alertable, PLARGE_INTEGER DelayInterval);
@@ -42,6 +44,28 @@ void nn_thread_detach(struct nn_thread *thread)
 }
 */
 
+/*
+void nn_mutex_init(struct nn_mutex *mutex)
+{
+    mutex->mutex = CreateMutex(NULL, FALSE, NULL);
+}
+
+void nn_mutex_lock(struct nn_mutex *mutex)
+{
+    WaitForSingleObject(mutex->mutex, INFINITE);
+}
+
+void nn_mutex_unlock(struct nn_mutex *mutex)
+{
+    ReleaseMutex(mutex->mutex);
+}
+
+void nn_mutex_destroy(struct nn_mutex *mutex)
+{
+    CloseHandle(mutex->mutex);
+}
+*/
+
 void nn_mutex_init(struct nn_mutex *mutex)
 {
     InitializeCriticalSection(&mutex->mutex);
@@ -62,6 +86,40 @@ void nn_mutex_destroy(struct nn_mutex *mutex)
     DeleteCriticalSection(&mutex->mutex);
 }
 
+#ifdef NAUNET_WIN32_COMPAT_MODE
+void nn_cond_init(struct nn_cond *cond)
+{
+    cond->condition = true;
+    cond->event = CreateEvent(NULL, TRUE, FALSE, NULL);
+}
+
+void nn_cond_wait(struct nn_cond *cond, struct nn_mutex *mutex)
+{
+    al_assert(cond->condition);
+    cond->condition = false;
+    nn_mutex_unlock(mutex);
+    WaitForSingleObject(cond->event, INFINITE);
+    ResetEvent(cond->event);
+    nn_mutex_lock(mutex);
+}
+
+bool nn_cond_is_waiting(struct nn_cond *cond)
+{
+    return !cond->condition;
+}
+
+void nn_cond_signal(struct nn_cond *cond)
+{
+    al_assert(!cond->condition);
+    cond->condition = true;
+    SetEvent(cond->event);
+}
+
+void nn_cond_destroy(struct nn_cond *cond)
+{
+    CloseHandle(cond->event);
+}
+#else
 void nn_cond_init(struct nn_cond *cond)
 {
     cond->condition = true;
@@ -91,3 +149,4 @@ void nn_cond_destroy(struct nn_cond *cond)
 {
     (void)cond;
 }
+#endif
diff --git a/src/util/timer/timer_windows.c b/src/util/timer/timer_windows.c
index f26e56a..4ff95ff 100644
--- a/src/util/timer/timer_windows.c
+++ b/src/util/timer/timer_windows.c
@@ -14,8 +14,17 @@ static const s64 UNIX_TIME_START = 0x019DB1DED53E8000; // January 1st, 1970 in "
 
 u64 nn_get_timestamp(void)
 {
-   FILETIME ft;
-   GetSystemTimePreciseAsFileTime(&ft);
-   return (((LARGE_INTEGER){ .LowPart = ft.dwLowDateTime, .HighPart = ft.dwHighDateTime }).QuadPart -
-       UNIX_TIME_START) / 10Lu;
+    FILETIME ft;
+#ifdef NAUNET_WIN32_COMPAT_MODE
+    GetSystemTimeAsFileTime(&ft);
+#else
+    // https://github.com/llvm/llvm-project/commit/3ec634e65a02d5f443cc982e9e00ec4e51143d07
+#if (_WIN32_WINNT >= _WIN32_WINNT_WIN8 && WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)) || \
+    (_WIN32_WINNT >= _WIN32_WINNT_WIN10)
+    GetSystemTimePreciseAsFileTime(&ft);
+#else
+#error "GetSystemTimePreciseAsFileTime() requested but not supported."
+#endif
+#endif
+    return (((LARGE_INTEGER){ .LowPart = ft.dwLowDateTime, .HighPart = ft.dwHighDateTime }).QuadPart - UNIX_TIME_START) / 10u;
 }
diff --git a/src/winwrap.h b/src/winwrap.h
index 0dfa8c6..c97abda 100644
--- a/src/winwrap.h
+++ b/src/winwrap.h
@@ -2,6 +2,7 @@
 
 #include <al/types.h>
 
+#define _WINSOCK_DEPRECATED_NO_WARNINGS
 // https://kirkshoop.github.io/2011/09/20/ntstatus.html
 #include <winsock2.h>
 #include <ws2tcpip.h>
-- 
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