| /* |
| * Win32 critical sections |
| * |
| * Copyright 1998 Alexandre Julliard |
| */ |
| |
| /* Note: critical sections are not implemented exactly the same way |
| * than under NT (LockSemaphore should be a real semaphore handle). |
| * But since they are even more different under Win95, it probably |
| * doesn't matter... |
| */ |
| |
| #include <assert.h> |
| #include <errno.h> |
| #include <stdio.h> |
| #include <sys/types.h> |
| #include <sys/sem.h> |
| #include "debug.h" |
| #include "windows.h" |
| #include "winerror.h" |
| #include "winbase.h" |
| #include "heap.h" |
| #include "k32obj.h" |
| #include "debug.h" |
| #include "thread.h" |
| |
| typedef struct |
| { |
| K32OBJ header; |
| THREAD_QUEUE wait_queue; |
| BOOL32 signaled; |
| } CRIT_SECTION; |
| |
| /* On some systems this is supposed to be defined in the program */ |
| #ifndef HAVE_UNION_SEMUN |
| union semun { |
| int val; |
| struct semid_ds *buf; |
| ushort *array; |
| }; |
| #endif |
| |
| static BOOL32 CRIT_SECTION_Signaled( K32OBJ *obj, DWORD thread_id ); |
| static BOOL32 CRIT_SECTION_Satisfied( K32OBJ *obj, DWORD thread_id ); |
| static void CRIT_SECTION_AddWait( K32OBJ *obj, DWORD thread_id ); |
| static void CRIT_SECTION_RemoveWait( K32OBJ *obj, DWORD thread_id ); |
| static void CRIT_SECTION_Destroy( K32OBJ *obj ); |
| |
| const K32OBJ_OPS CRITICAL_SECTION_Ops = |
| { |
| CRIT_SECTION_Signaled, /* signaled */ |
| CRIT_SECTION_Satisfied, /* satisfied */ |
| CRIT_SECTION_AddWait, /* add_wait */ |
| CRIT_SECTION_RemoveWait, /* remove_wait */ |
| NULL, /* read */ |
| NULL, /* write */ |
| CRIT_SECTION_Destroy /* destroy */ |
| }; |
| |
| /*********************************************************************** |
| * InitializeCriticalSection (KERNEL32.472) (NTDLL.406) |
| */ |
| void WINAPI InitializeCriticalSection( CRITICAL_SECTION *crit ) |
| { |
| CRIT_SECTION *obj; |
| |
| crit->LockCount = -1; |
| crit->RecursionCount = 0; |
| crit->OwningThread = 0; |
| crit->LockSemaphore = 0; |
| if (SystemHeap) |
| { |
| if (!(obj = (CRIT_SECTION *)HeapAlloc( SystemHeap, 0, sizeof(*obj) ))) |
| return; /* No way to return an error... */ |
| obj->header.type = K32OBJ_CRITICAL_SECTION; |
| obj->header.refcount = 1; |
| obj->wait_queue = NULL; |
| obj->signaled = FALSE; |
| crit->LockSemaphore = (HANDLE32)obj; |
| crit->Reserved = (DWORD)-1; |
| } |
| else |
| { |
| union semun val; |
| crit->Reserved = (DWORD)semget( IPC_PRIVATE, 1, IPC_CREAT | 0777 ); |
| if (crit->Reserved == (DWORD)-1) |
| { |
| perror( "semget" ); |
| return; |
| } |
| val.val = 0; |
| semctl( (int)crit->Reserved, 0, SETVAL, val ); |
| } |
| } |
| |
| |
| /*********************************************************************** |
| * DeleteCriticalSection (KERNEL32.185) (NTDLL.327) |
| */ |
| void WINAPI DeleteCriticalSection( CRITICAL_SECTION *crit ) |
| { |
| CRIT_SECTION *obj = (CRIT_SECTION *)crit->LockSemaphore; |
| |
| if (obj) |
| { |
| if (crit->RecursionCount) /* Should not happen */ |
| MSG("Deleting owned critical section (%p)\n", crit ); |
| crit->LockCount = -1; |
| crit->RecursionCount = 0; |
| crit->OwningThread = 0; |
| crit->LockSemaphore = 0; |
| K32OBJ_DecCount( &obj->header ); |
| } |
| else if (crit->Reserved != (DWORD)-1) |
| { |
| semctl( (int)crit->Reserved, 0, IPC_RMID, (union semun)0 ); |
| } |
| } |
| |
| |
| /*********************************************************************** |
| * EnterCriticalSection (KERNEL32.195) (NTDLL.344) |
| */ |
| void WINAPI EnterCriticalSection( CRITICAL_SECTION *crit ) |
| { |
| if ((crit->Reserved==-1) && !(crit->LockSemaphore)) { |
| FIXME(win32,"entering uninitialized section(%p)?\n",crit); |
| InitializeCriticalSection(crit); |
| } |
| if (InterlockedIncrement( &crit->LockCount )) |
| { |
| if (crit->OwningThread == GetCurrentThreadId()) |
| { |
| crit->RecursionCount++; |
| return; |
| } |
| /* Now wait for it */ |
| if (crit->LockSemaphore) |
| { |
| WAIT_STRUCT *wait = &THREAD_Current()->wait_struct; |
| SYSTEM_LOCK(); |
| wait->count = 1; |
| wait->signaled = WAIT_FAILED; |
| wait->wait_all = FALSE; |
| wait->objs[0] = (K32OBJ *)crit->LockSemaphore; |
| K32OBJ_IncCount( wait->objs[0] ); |
| SYNC_WaitForCondition( wait, INFINITE32 ); |
| K32OBJ_DecCount( wait->objs[0] ); |
| SYSTEM_UNLOCK(); |
| } |
| else if (crit->Reserved != (DWORD)-1) |
| { |
| int ret; |
| struct sembuf sop; |
| sop.sem_num = 0; |
| sop.sem_op = -1; |
| sop.sem_flg = SEM_UNDO; |
| do |
| { |
| ret = semop( (int)crit->Reserved, &sop, 1 ); |
| } while ((ret == -1) && (errno == EINTR)); |
| } |
| else |
| { |
| MSG( "Uninitialized critical section (%p)\n", crit ); |
| return; |
| } |
| } |
| crit->OwningThread = GetCurrentThreadId(); |
| crit->RecursionCount = 1; |
| } |
| |
| |
| /*********************************************************************** |
| * TryEnterCriticalSection (KERNEL32.898) (NTDLL.969) |
| */ |
| BOOL32 WINAPI TryEnterCriticalSection( CRITICAL_SECTION *crit ) |
| { |
| if (InterlockedIncrement( &crit->LockCount )) |
| { |
| if (crit->OwningThread == GetCurrentThreadId()) |
| { |
| crit->RecursionCount++; |
| return TRUE; |
| } |
| /* FIXME: this doesn't work */ |
| InterlockedDecrement( &crit->LockCount ); |
| return FALSE; |
| } |
| crit->OwningThread = GetCurrentThreadId(); |
| crit->RecursionCount = 1; |
| return TRUE; |
| } |
| |
| |
| /*********************************************************************** |
| * LeaveCriticalSection (KERNEL32.494) (NTDLL.426) |
| */ |
| void WINAPI LeaveCriticalSection( CRITICAL_SECTION *crit ) |
| { |
| if (crit->OwningThread != GetCurrentThreadId()) return; |
| |
| if (--crit->RecursionCount) |
| { |
| InterlockedDecrement( &crit->LockCount ); |
| return; |
| } |
| crit->OwningThread = 0; |
| if (InterlockedDecrement( &crit->LockCount ) >= 0) |
| { |
| /* Someone is waiting */ |
| if (crit->LockSemaphore) |
| { |
| CRIT_SECTION *obj = (CRIT_SECTION *)crit->LockSemaphore; |
| SYSTEM_LOCK(); |
| obj->signaled = TRUE; |
| SYNC_WakeUp( &obj->wait_queue, 1 ); |
| SYSTEM_UNLOCK(); |
| } |
| else if (crit->Reserved != (DWORD)-1) |
| { |
| struct sembuf sop; |
| sop.sem_num = 0; |
| sop.sem_op = 1; |
| sop.sem_flg = SEM_UNDO; |
| semop( (int)crit->Reserved, &sop, 1 ); |
| } |
| } |
| } |
| |
| |
| /*********************************************************************** |
| * MakeCriticalSectionGlobal (KERNEL32.515) |
| */ |
| void WINAPI MakeCriticalSectionGlobal( CRITICAL_SECTION *crit ) |
| { |
| /* Nothing to do: a critical section is always global */ |
| } |
| |
| |
| /*********************************************************************** |
| * ReinitializeCriticalSection (KERNEL32.581) |
| */ |
| void WINAPI ReinitializeCriticalSection( CRITICAL_SECTION *crit ) |
| { |
| DeleteCriticalSection( crit ); |
| InitializeCriticalSection( crit ); |
| } |
| |
| |
| /*********************************************************************** |
| * CRIT_SECTION_Signaled |
| */ |
| static BOOL32 CRIT_SECTION_Signaled( K32OBJ *obj, DWORD thread_id ) |
| { |
| CRIT_SECTION *crit = (CRIT_SECTION *)obj; |
| assert( obj->type == K32OBJ_CRITICAL_SECTION ); |
| return crit->signaled; |
| } |
| |
| |
| /*********************************************************************** |
| * CRIT_SECTION_Satisfied |
| * |
| * Wait on this object has been satisfied. |
| */ |
| static BOOL32 CRIT_SECTION_Satisfied( K32OBJ *obj, DWORD thread_id ) |
| { |
| CRIT_SECTION *crit = (CRIT_SECTION *)obj; |
| assert( obj->type == K32OBJ_CRITICAL_SECTION ); |
| /* Only one thread is allowed to wake up */ |
| crit->signaled = FALSE; |
| return FALSE; /* Not abandoned */ |
| } |
| |
| |
| /*********************************************************************** |
| * CRIT_SECTION_AddWait |
| * |
| * Add thread to object wait queue. |
| */ |
| static void CRIT_SECTION_AddWait( K32OBJ *obj, DWORD thread_id ) |
| { |
| CRIT_SECTION *crit = (CRIT_SECTION *)obj; |
| assert( obj->type == K32OBJ_CRITICAL_SECTION ); |
| THREAD_AddQueue( &crit->wait_queue, THREAD_ID_TO_THDB(thread_id) ); |
| } |
| |
| |
| /*********************************************************************** |
| * CRIT_SECTION_RemoveWait |
| * |
| * Remove current thread from object wait queue. |
| */ |
| static void CRIT_SECTION_RemoveWait( K32OBJ *obj, DWORD thread_id ) |
| { |
| CRIT_SECTION *crit = (CRIT_SECTION *)obj; |
| assert( obj->type == K32OBJ_CRITICAL_SECTION ); |
| THREAD_RemoveQueue( &crit->wait_queue, THREAD_ID_TO_THDB(thread_id) ); |
| } |
| |
| |
| /*********************************************************************** |
| * CRIT_SECTION_Destroy |
| */ |
| static void CRIT_SECTION_Destroy( K32OBJ *obj ) |
| { |
| CRIT_SECTION *crit = (CRIT_SECTION *)obj; |
| assert( obj->type == K32OBJ_CRITICAL_SECTION ); |
| /* There cannot be any thread on the list since the ref count is 0 */ |
| assert( crit->wait_queue == NULL ); |
| obj->type = K32OBJ_UNKNOWN; |
| HeapFree( SystemHeap, 0, crit ); |
| } |
