ntdll: HACK: Add WINE_ALERT_SIMULATE_SCHED_QUANTUM option.

And enable it for GTA 5.

CW-Bug-Id: #21194

Author: Paul Gofman

dlls/ntdll/unix/loader.c

@@ -1922,6 +1922,7 @@ static ULONG_PTR get_image_address(void)
 
 BOOL ac_odyssey;
 BOOL fsync_simulate_sched_quantum;
+BOOL alert_simulate_sched_quantum;
 
 static void hacks_init(void)
 {
@@ -1945,6 +1946,16 @@ static void hacks_init(void)
     if (fsync_simulate_sched_quantum)
         ERR("HACK: Simulating sched quantum in fsync.\n");
 
+    env_str = getenv("WINE_ALERT_SIMULATE_SCHED_QUANTUM");
+    if (env_str)
+        alert_simulate_sched_quantum = !!atoi(env_str);
+    else if (main_argc > 1)
+    {
+        alert_simulate_sched_quantum = !!strstr(main_argv[1], "GTA5.exe");
+    }
+    if (alert_simulate_sched_quantum)
+        ERR("HACK: Simulating sched quantum in NtWaitForAlertByThreadId.\n");
+
     switch (sgi ? atoi( sgi ) : -1)
     {
     case 25700: /* Madballs in Babo: Invasion */

dlls/ntdll/unix/sync.c

@@ -2706,6 +2706,7 @@ NTSTATUS WINAPI NtWaitForAlertByThreadId( const void *address, const LARGE_INTEG
 NTSTATUS WINAPI NtWaitForAlertByThreadId( const void *address, const LARGE_INTEGER *timeout )
 {
     union tid_alert_entry *entry = get_tid_alert_entry( NtCurrentTeb()->ClientId.UniqueThread );
+    BOOL waited = FALSE;
     NTSTATUS status;
 
     TRACE( "%p %s\n", address, debugstr_timeout( timeout ) );
@@ -2741,8 +2742,15 @@ NTSTATUS WINAPI NtWaitForAlertByThreadId( const void *address, const LARGE_INTEG
             else
                 ret = futex_wait( futex, 0, NULL );
 
+            if (!timeout || timeout->QuadPart)
+                waited = TRUE;
+
             if (ret == -1 && errno == ETIMEDOUT) return STATUS_TIMEOUT;
         }
+
+        if (alert_simulate_sched_quantum && waited)
+            usleep(0);
+
         return STATUS_ALERTED;
     }
 #endif

dlls/ntdll/unix/unix_private.h

@@ -180,6 +180,7 @@ extern struct ldt_copy __wine_ldt_copy;
 
 extern BOOL ac_odyssey;
 extern BOOL fsync_simulate_sched_quantum;
+extern BOOL alert_simulate_sched_quantum;
 
 extern void init_environment(void);
 extern void init_startup_info(void);