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slow & highly contentious implementation of barriers using more basic sync primitives; fall back if sync barriers not present in win32 version

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This commit is contained in:
Ryan Fleury
2026-05-12 13:48:57 -07:00
parent 641a7c8b30
commit d4623a7ddf
8 changed files with 230 additions and 25 deletions
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src/win32/base/win32_base.c
+47 -16
View File
@@ -8,6 +8,12 @@
typedef HRESULT W32_SetThreadDescription_Type(HANDLE hThread, PCWSTR lpThreadDescription);
global W32_SetThreadDescription_Type *w32_SetThreadDescription_func = 0;
typedef BOOL W32_InitializeSynchronizationBarrier_Type(W32_SYNCHRONIZATION_BARRIER *lpBarrier, LONG lTotalThreads, LONG lSpinCount);
global W32_InitializeSynchronizationBarrier_Type *w32_InitializeSynchronizationBarrier_func = 0;
typedef BOOL W32_DeleteSynchronizationBarrier_Type(W32_SYNCHRONIZATION_BARRIER *lpBarrier);
global W32_DeleteSynchronizationBarrier_Type *w32_DeleteSynchronizationBarrier_func = 0;
typedef BOOL W32_EnterSynchronizationBarrier_Type(W32_SYNCHRONIZATION_BARRIER *lpBarrier, DWORD dwFlags);
global W32_EnterSynchronizationBarrier_Type *w32_EnterSynchronizationBarrier_func = 0;
global RIO_EXTENSION_FUNCTION_TABLE w32_rio_functions = {0};
////////////////////////////////
@@ -42,10 +48,10 @@ w32_date_time_from_system_time(DateTime *out, SYSTEMTIME *in)
out->year = in->wYear;
out->mon = in->wMonth - 1;
out->wday = in->wDayOfWeek;
out->day = in->wDay;
out->hour = in->wHour;
out->min = in->wMinute;
out->sec = in->wSecond;
out->day = in->wDay;
out->hour = in->wHour;
out->min = in->wMinute;
out->sec = in->wSecond;
out->msec = in->wMilliseconds;
}
@@ -681,34 +687,56 @@ semaphore_drop(Semaphore semaphore)
internal Barrier
barrier_alloc(U64 count)
{
W32_Entity *entity = w32_entity_alloc(W32_EntityKind_Barrier);
if(entity != 0)
Barrier result = {0};
if(w32_InitializeSynchronizationBarrier_func != 0)
{
BOOL init_good = InitializeSynchronizationBarrier(&entity->sb, count, -1);
(void)init_good;
W32_Entity *entity = w32_entity_alloc(W32_EntityKind_Barrier);
if(entity != 0)
{
BOOL init_good = w32_InitializeSynchronizationBarrier_func(&entity->sb, count, -1);
(void)init_good;
}
result.u64[0] = IntFromPtr(entity);
}
else
{
result = slow_barrier_alloc(count);
}
Barrier result = {IntFromPtr(entity)};
return result;
}
internal void
barrier_release(Barrier barrier)
{
W32_Entity *entity = (W32_Entity*)PtrFromInt(barrier.u64[0]);
if(entity != 0)
if(w32_InitializeSynchronizationBarrier_func != 0)
{
DeleteSynchronizationBarrier(&entity->sb);
w32_entity_release(entity);
W32_Entity *entity = (W32_Entity*)PtrFromInt(barrier.u64[0]);
if(entity != 0)
{
w32_DeleteSynchronizationBarrier_func(&entity->sb);
w32_entity_release(entity);
}
}
else
{
slow_barrier_release(barrier);
}
}
internal void
barrier_wait(Barrier barrier)
{
W32_Entity *entity = (W32_Entity*)PtrFromInt(barrier.u64[0]);
if(entity != 0)
if(w32_InitializeSynchronizationBarrier_func != 0)
{
EnterSynchronizationBarrier(&entity->sb, 0);
W32_Entity *entity = (W32_Entity*)PtrFromInt(barrier.u64[0]);
if(entity != 0)
{
w32_EnterSynchronizationBarrier_func(&entity->sb, 0);
}
}
else
{
slow_barrier_wait(barrier);
}
}
@@ -1741,6 +1769,9 @@ w32_entry_point_caller(int argc, WCHAR **wargv)
{
HMODULE module = LoadLibraryA("kernel32.dll");
w32_SetThreadDescription_func = (W32_SetThreadDescription_Type *)GetProcAddress(module, "SetThreadDescription");
w32_InitializeSynchronizationBarrier_func = (W32_InitializeSynchronizationBarrier_Type *)GetProcAddress(module, "InitializeSynchronizationBarrier");
w32_DeleteSynchronizationBarrier_func = (W32_DeleteSynchronizationBarrier_Type *)GetProcAddress(module, "DeleteSynchronizationBarrier");
w32_EnterSynchronizationBarrier_func = (W32_EnterSynchronizationBarrier_Type *)GetProcAddress(module, "EnterSynchronizationBarrier");
FreeLibrary(module);
}
src/win32/base/win32_base.h
+11 -1
View File
@@ -53,6 +53,16 @@ typedef enum W32_EntityKind
}
W32_EntityKind;
typedef struct W32_SYNCHRONIZATION_BARRIER W32_SYNCHRONIZATION_BARRIER;
struct W32_SYNCHRONIZATION_BARRIER
{
U32 reserved_0;
U32 reserved_1;
U64 reserved_2[2];
U32 reserved_3;
U32 reserved_4;
};
typedef struct W32_Entity W32_Entity;
struct W32_Entity
{
@@ -70,7 +80,7 @@ struct W32_Entity
CRITICAL_SECTION mutex;
SRWLOCK rw_mutex;
CONDITION_VARIABLE cv;
SYNCHRONIZATION_BARRIER sb;
W32_SYNCHRONIZATION_BARRIER sb;
};
};