| /* |
| * Task functions |
| * |
| * Copyright 1995 Alexandre Julliard |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include "windows.h" |
| #include "task.h" |
| #include "callback.h" |
| #include "directory.h" |
| #include "dos_fs.h" |
| #include "file.h" |
| #include "debugger.h" |
| #include "global.h" |
| #include "instance.h" |
| #include "miscemu.h" |
| #include "module.h" |
| #include "neexe.h" |
| #include "options.h" |
| #include "queue.h" |
| #include "selectors.h" |
| #include "toolhelp.h" |
| #include "stddebug.h" |
| #include "debug.h" |
| #include "dde_proc.h" |
| |
| /* Min. number of thunks allocated when creating a new segment */ |
| #define MIN_THUNKS 32 |
| |
| /* 32-bit stack size for each task */ |
| /* Must not be greater than 64k, or MAKE_SEGPTR won't work */ |
| #define STACK32_SIZE 0x10000 |
| |
| /* ------ Internal variables ------ */ |
| |
| static HTASK hFirstTask = 0; |
| static HTASK hCurrentTask = 0; |
| static HTASK hTaskToKill = 0; |
| static HTASK hLockedTask = 0; |
| static WORD nTaskCount = 0; |
| static HANDLE hDOSEnvironment = 0; |
| |
| /* ------ Internal declarations ------ */ |
| |
| /* TASK_Reschedule() 16-bit entry point */ |
| static FARPROC TASK_RescheduleProc; |
| |
| #ifdef WINELIB |
| #define TASK_SCHEDULE() TASK_Reschedule(); |
| #else |
| #define TASK_SCHEDULE() CallTo16_word_(TASK_RescheduleProc,0) |
| #endif |
| |
| static HANDLE TASK_CreateDOSEnvironment(void); |
| |
| /*********************************************************************** |
| * TASK_Init |
| */ |
| BOOL TASK_Init(void) |
| { |
| TASK_RescheduleProc = (FARPROC)GetWndProcEntry16( "TASK_Reschedule" ); |
| if (!(hDOSEnvironment = TASK_CreateDOSEnvironment())) |
| fprintf( stderr, "Not enough memory for DOS Environment\n" ); |
| return (hDOSEnvironment != 0); |
| } |
| |
| |
| /*********************************************************************** |
| * TASK_CreateDOSEnvironment |
| * |
| * Create the original DOS environment. |
| */ |
| static HANDLE TASK_CreateDOSEnvironment(void) |
| { |
| static const char program_name[] = "KRNL386.EXE"; |
| char **e, *p; |
| int initial_size, size, i, winpathlen, sysdirlen; |
| HANDLE handle; |
| |
| extern char **environ; |
| |
| /* DOS environment format: |
| * ASCIIZ string 1 |
| * ASCIIZ string 2 |
| * ... |
| * ASCIIZ string n |
| * ASCIIZ PATH=xxx |
| * BYTE 0 |
| * WORD 1 |
| * ASCIIZ program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE) |
| */ |
| |
| /* First compute the size of the fixed part of the environment */ |
| |
| for (i = winpathlen = 0; ; i++) |
| { |
| int len = DIR_GetDosPath( i, NULL, 0 ); |
| if (!len) break; |
| winpathlen += len + 1; |
| } |
| if (!winpathlen) winpathlen = 1; |
| sysdirlen = GetSystemDirectory( NULL, 0 ) + 1; |
| initial_size = 5 + winpathlen + /* PATH=xxxx */ |
| 1 + /* BYTE 0 at end */ |
| sizeof(WORD) + /* WORD 1 */ |
| sysdirlen + /* program directory */ |
| strlen(program_name) + 1; /* program name */ |
| |
| /* Compute the total size of the Unix environment (except path) */ |
| |
| for (e = environ, size = initial_size; *e; e++) |
| { |
| if (lstrncmpi(*e, "path=", 5)) |
| { |
| int len = strlen(*e) + 1; |
| if (size + len >= 32767) |
| { |
| fprintf( stderr, "Warning: environment larger than 32k.\n" ); |
| break; |
| } |
| size += len; |
| } |
| } |
| |
| |
| /* Now allocate the environment */ |
| |
| if (!(handle = GlobalAlloc( GMEM_FIXED, size ))) return 0; |
| p = (char *)GlobalLock( handle ); |
| |
| /* And fill it with the Unix environment */ |
| |
| for (e = environ, size = initial_size; *e; e++) |
| { |
| if (lstrncmpi(*e, "path=", 5)) |
| { |
| int len = strlen(*e) + 1; |
| if (size + len >= 32767) break; |
| strcpy( p, *e ); |
| size += len; |
| p += len; |
| } |
| } |
| |
| /* Now add the path */ |
| |
| strcpy( p, "PATH=" ); |
| for (i = 0, p += 5; ; i++) |
| { |
| if (!DIR_GetDosPath( i, p, winpathlen )) break; |
| p += strlen(p); |
| *p++ = ';'; |
| } |
| if (p[-1] == ';') p[-1] = '\0'; |
| else p++; |
| |
| /* Now add the program name */ |
| |
| *p++ = '\0'; |
| *(WORD *)p = 1; |
| p += sizeof(WORD); |
| GetSystemDirectory( p, sysdirlen ); |
| strcat( p, "\\" ); |
| strcat( p, program_name ); |
| |
| /* Display it */ |
| |
| p = (char *) GlobalLock( handle ); |
| dprintf_task(stddeb, "Master DOS environment at %p\n", p); |
| for (; *p; p += strlen(p) + 1) dprintf_task(stddeb, " %s\n", p); |
| dprintf_task( stddeb, "Progname: %s\n", p+3 ); |
| |
| return handle; |
| } |
| |
| |
| /*********************************************************************** |
| * TASK_LinkTask |
| */ |
| static void TASK_LinkTask( HTASK hTask ) |
| { |
| HTASK *prevTask; |
| TDB *pTask; |
| |
| if (!(pTask = (TDB *)GlobalLock( hTask ))) return; |
| prevTask = &hFirstTask; |
| while (*prevTask) |
| { |
| TDB *prevTaskPtr = (TDB *)GlobalLock( *prevTask ); |
| if (prevTaskPtr->priority >= pTask->priority) break; |
| prevTask = &prevTaskPtr->hNext; |
| } |
| pTask->hNext = *prevTask; |
| *prevTask = hTask; |
| nTaskCount++; |
| } |
| |
| |
| /*********************************************************************** |
| * TASK_UnlinkTask |
| */ |
| static void TASK_UnlinkTask( HTASK hTask ) |
| { |
| HTASK *prevTask; |
| TDB *pTask; |
| |
| prevTask = &hFirstTask; |
| while (*prevTask && (*prevTask != hTask)) |
| { |
| pTask = (TDB *)GlobalLock( *prevTask ); |
| prevTask = &pTask->hNext; |
| } |
| if (*prevTask) |
| { |
| pTask = (TDB *)GlobalLock( *prevTask ); |
| *prevTask = pTask->hNext; |
| pTask->hNext = 0; |
| nTaskCount--; |
| } |
| } |
| |
| |
| /*********************************************************************** |
| * TASK_CreateThunks |
| * |
| * Create a thunk free-list in segment 'handle', starting from offset 'offset' |
| * and containing 'count' entries. |
| */ |
| static void TASK_CreateThunks( HGLOBAL handle, WORD offset, WORD count ) |
| { |
| int i; |
| WORD free; |
| THUNKS *pThunk; |
| |
| pThunk = (THUNKS *)((BYTE *)GlobalLock( handle ) + offset); |
| pThunk->next = 0; |
| pThunk->magic = THUNK_MAGIC; |
| pThunk->free = (int)&pThunk->thunks - (int)pThunk; |
| free = pThunk->free; |
| for (i = 0; i < count-1; i++) |
| { |
| free += 8; /* Offset of next thunk */ |
| pThunk->thunks[4*i] = free; |
| } |
| pThunk->thunks[4*i] = 0; /* Last thunk */ |
| } |
| |
| |
| /*********************************************************************** |
| * TASK_AllocThunk |
| * |
| * Allocate a thunk for MakeProcInstance(). |
| */ |
| #ifndef WINELIB32 |
| static SEGPTR TASK_AllocThunk( HTASK hTask ) |
| { |
| TDB *pTask; |
| THUNKS *pThunk; |
| WORD sel, base; |
| |
| if (!(pTask = (TDB *)GlobalLock( hTask ))) return 0; |
| sel = pTask->hCSAlias; |
| pThunk = &pTask->thunks; |
| base = (int)pThunk - (int)pTask; |
| while (!pThunk->free) |
| { |
| sel = pThunk->next; |
| if (!sel) /* Allocate a new segment */ |
| { |
| sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8, |
| pTask->hPDB, TRUE, FALSE, FALSE ); |
| if (!sel) return (SEGPTR)0; |
| TASK_CreateThunks( sel, 0, MIN_THUNKS ); |
| pThunk->next = sel; |
| } |
| pThunk = (THUNKS *)GlobalLock( sel ); |
| base = 0; |
| } |
| base += pThunk->free; |
| pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free); |
| return MAKELONG( base, sel ); |
| } |
| #endif |
| |
| |
| /*********************************************************************** |
| * TASK_FreeThunk |
| * |
| * Free a MakeProcInstance() thunk. |
| */ |
| #ifndef WINELIB32 |
| static BOOL TASK_FreeThunk( HTASK hTask, SEGPTR thunk ) |
| { |
| TDB *pTask; |
| THUNKS *pThunk; |
| WORD sel, base; |
| |
| if (!(pTask = (TDB *)GlobalLock( hTask ))) return 0; |
| sel = pTask->hCSAlias; |
| pThunk = &pTask->thunks; |
| base = (int)pThunk - (int)pTask; |
| while (sel && (sel != HIWORD(thunk))) |
| { |
| sel = pThunk->next; |
| pThunk = (THUNKS *)GlobalLock( sel ); |
| base = 0; |
| } |
| if (!sel) return FALSE; |
| *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free; |
| pThunk->free = LOWORD(thunk) - base; |
| return TRUE; |
| } |
| #endif |
| |
| |
| /*********************************************************************** |
| * TASK_CallToStart |
| * |
| * 32-bit entry point for a new task. This function is responsible for |
| * setting up the registers and jumping to the 16-bit entry point. |
| */ |
| #ifndef WINELIB |
| static void TASK_CallToStart(void) |
| { |
| int cs_reg, ds_reg, ip_reg; |
| TDB *pTask = (TDB *)GlobalLock( hCurrentTask ); |
| NE_MODULE *pModule = (NE_MODULE *)GlobalLock( pTask->hModule ); |
| SEGTABLEENTRY *pSegTable = NE_SEG_TABLE( pModule ); |
| |
| /* Registers at initialization must be: |
| * ax zero |
| * bx stack size in bytes |
| * cx heap size in bytes |
| * si previous app instance |
| * di current app instance |
| * bp zero |
| * es selector to the PSP |
| * ds dgroup of the application |
| * ss stack selector |
| * sp top of the stack |
| */ |
| |
| cs_reg = pSegTable[pModule->cs - 1].selector; |
| ip_reg = pModule->ip; |
| ds_reg = pSegTable[pModule->dgroup - 1].selector; |
| |
| IF1632_Saved16_ss = pTask->ss; |
| IF1632_Saved16_sp = pTask->sp; |
| dprintf_task( stddeb, "Starting main program: cs:ip=%04x:%04x ds=%04x ss:sp=%04x:%04x\n", |
| cs_reg, ip_reg, ds_reg, |
| IF1632_Saved16_ss, IF1632_Saved16_sp); |
| |
| CallTo16_regs_( (FARPROC)(cs_reg << 16 | ip_reg), ds_reg, |
| pTask->hPDB /*es*/, 0 /*bp*/, 0 /*ax*/, |
| pModule->stack_size /*bx*/, pModule->heap_size /*cx*/, |
| 0 /*dx*/, 0 /*si*/, ds_reg /*di*/ ); |
| |
| /* This should never return */ |
| fprintf( stderr, "TASK_CallToStart: Main program returned!\n" ); |
| TASK_KillCurrentTask( 1 ); |
| } |
| #endif |
| |
| |
| /*********************************************************************** |
| * TASK_CreateTask |
| */ |
| HTASK TASK_CreateTask( HMODULE hModule, HANDLE hInstance, HANDLE hPrevInstance, |
| HANDLE hEnvironment, char *cmdLine, WORD cmdShow ) |
| { |
| HTASK hTask; |
| TDB *pTask; |
| HANDLE hParentEnv; |
| NE_MODULE *pModule; |
| SEGTABLEENTRY *pSegTable; |
| LPSTR name; |
| char filename[256]; |
| #ifndef WINELIB32 |
| char *stack16Top, *stack32Top; |
| STACK16FRAME *frame16; |
| STACK32FRAME *frame32; |
| extern DWORD CALL16_RetAddr_word; |
| #endif |
| |
| if (!(pModule = (NE_MODULE *)GlobalLock( hModule ))) return 0; |
| pSegTable = NE_SEG_TABLE( pModule ); |
| |
| /* Allocate the task structure */ |
| |
| hTask = GLOBAL_Alloc( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB), |
| hModule, FALSE, FALSE, FALSE ); |
| if (!hTask) return 0; |
| pTask = (TDB *)GlobalLock( hTask ); |
| |
| /* Allocate the new environment block */ |
| |
| if (!(hParentEnv = hEnvironment)) |
| { |
| TDB *pParent = (TDB *)GlobalLock( hCurrentTask ); |
| hParentEnv = pParent ? pParent->pdb.environment : hDOSEnvironment; |
| } |
| /* FIXME: do we really need to make a copy also when */ |
| /* we don't use the parent environment? */ |
| if (!(hEnvironment = GlobalAlloc( GMEM_FIXED, GlobalSize( hParentEnv ) ))) |
| { |
| GlobalFree( hTask ); |
| return 0; |
| } |
| memcpy( GlobalLock( hEnvironment ), GlobalLock( hParentEnv ), |
| GlobalSize( hParentEnv ) ); |
| |
| /* Get current directory */ |
| |
| GetModuleFileName( hModule, filename, sizeof(filename) ); |
| name = strrchr(filename, '\\'); |
| if (name) *(name+1) = 0; |
| |
| /* Fill the task structure */ |
| |
| pTask->nEvents = 1; /* So the task can be started */ |
| pTask->hSelf = hTask; |
| pTask->flags = 0; |
| pTask->version = pModule->expected_version; |
| pTask->hInstance = hInstance; |
| pTask->hPrevInstance = hPrevInstance; |
| pTask->hModule = hModule; |
| pTask->hParent = hCurrentTask; |
| #ifdef WINELIB |
| pTask->curdrive = 'C' - 'A' + 0x80; |
| strcpy( pTask->curdir, "\\" ); |
| #else |
| pTask->curdrive = filename[0] - 'A' + 0x80; |
| strcpy( pTask->curdir, filename+2 ); |
| #endif |
| pTask->magic = TDB_MAGIC; |
| pTask->nCmdShow = cmdShow; |
| |
| /* Create the thunks block */ |
| |
| TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 ); |
| |
| /* Copy the module name */ |
| |
| name = MODULE_GetModuleName( hModule ); |
| strncpy( pTask->module_name, name, sizeof(pTask->module_name) ); |
| |
| /* Allocate a selector for the PDB */ |
| |
| pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB), |
| hModule, FALSE, FALSE, FALSE, NULL ); |
| |
| /* Fill the PDB */ |
| |
| pTask->pdb.int20 = 0x20cd; |
| #ifndef WINELIB |
| pTask->pdb.dispatcher[0] = 0x9a; /* ljmp */ |
| *(DWORD *)&pTask->pdb.dispatcher[1] = MODULE_GetEntryPoint( GetModuleHandle("KERNEL"), 102 ); /* KERNEL.102 is DOS3Call() */ |
| pTask->pdb.savedint22 = INT_GetHandler( 0x22 ); |
| pTask->pdb.savedint23 = INT_GetHandler( 0x23 ); |
| pTask->pdb.savedint24 = INT_GetHandler( 0x24 ); |
| pTask->pdb.fileHandlesPtr = (SEGPTR)MAKELONG( 0x18, |
| GlobalHandleToSel(pTask->hPDB) ); |
| #else |
| pTask->pdb.fileHandlesPtr = pTask->pdb.fileHandles; |
| #endif |
| memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) ); |
| pTask->pdb.environment = hEnvironment; |
| pTask->pdb.nbFiles = 20; |
| lstrcpyn( pTask->pdb.cmdLine + 1, cmdLine, 127 ); |
| pTask->pdb.cmdLine[0] = strlen( pTask->pdb.cmdLine + 1 ); |
| |
| /* Get the compatibility flags */ |
| |
| pTask->compat_flags = GetProfileInt( name, "Compatibility", 0 ); |
| |
| /* Allocate a code segment alias for the TDB */ |
| |
| pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask, |
| sizeof(TDB), pTask->hPDB, TRUE, |
| FALSE, FALSE, NULL ); |
| |
| /* Set the owner of the environment block */ |
| |
| FarSetOwner( pTask->pdb.environment, pTask->hPDB ); |
| |
| /* Default DTA overwrites command-line */ |
| |
| pTask->dta = MAKELONG( (int)&pTask->pdb.cmdLine - (int)&pTask->pdb, |
| pTask->hPDB ); |
| |
| /* Allocate the 32-bit stack */ |
| |
| #ifndef WINELIB |
| pTask->hStack32 = GLOBAL_Alloc( GMEM_FIXED, STACK32_SIZE, pTask->hPDB, |
| FALSE, FALSE, FALSE ); |
| |
| /* Create the 32-bit stack frame */ |
| |
| *(DWORD *)GlobalLock(pTask->hStack32) = 0xDEADBEEF; |
| stack32Top = (char*)GlobalLock(pTask->hStack32) + STACK32_SIZE; |
| frame32 = (STACK32FRAME *)stack32Top - 1; |
| frame32->saved_esp = (DWORD)stack32Top; |
| frame32->edi = 0; |
| frame32->esi = 0; |
| frame32->edx = 0; |
| frame32->ecx = 0; |
| frame32->ebx = 0; |
| frame32->ebp = 0; |
| frame32->retaddr = (DWORD)TASK_CallToStart; |
| frame32->codeselector = WINE_CODE_SELECTOR; |
| pTask->esp = (DWORD)frame32; |
| |
| /* Create the 16-bit stack frame */ |
| |
| pTask->ss = hInstance; |
| pTask->sp = ((pModule->sp != 0) ? pModule->sp : |
| pSegTable[pModule->ss-1].minsize + pModule->stack_size) & ~1; |
| stack16Top = (char *)PTR_SEG_OFF_TO_LIN( pTask->ss, pTask->sp ); |
| frame16 = (STACK16FRAME *)stack16Top - 1; |
| frame16->saved_ss = 0; /*pTask->ss;*/ |
| frame16->saved_sp = 0; /*pTask->sp;*/ |
| frame16->ds = frame16->es = pTask->hInstance; |
| frame16->entry_point = 0; |
| frame16->ordinal_number = 24; /* WINPROCS.24 is TASK_Reschedule */ |
| frame16->dll_id = 24; /* WINPROCS */ |
| frame16->bp = 0; |
| frame16->ip = LOWORD( CALL16_RetAddr_word ); |
| frame16->cs = HIWORD( CALL16_RetAddr_word ); |
| pTask->sp -= sizeof(STACK16FRAME); |
| |
| /* If there's no 16-bit stack yet, use a part of the new task stack */ |
| /* This is only needed to have a stack to switch from on the first */ |
| /* call to DirectedYield(). */ |
| |
| if (!IF1632_Saved16_ss) |
| { |
| IF1632_Saved16_ss = pTask->ss; |
| IF1632_Saved16_sp = pTask->sp; |
| } |
| |
| /* Add a breakpoint at the start of the task */ |
| |
| if (Options.debug) |
| { |
| DBG_ADDR addr = { pSegTable[pModule->cs-1].selector, pModule->ip }; |
| fprintf( stderr, "Task '%s': ", name ); |
| DEBUG_AddBreakpoint( &addr ); |
| } |
| #endif |
| |
| /* Add the task to the linked list */ |
| |
| TASK_LinkTask( hTask ); |
| |
| dprintf_task( stddeb, "CreateTask: module='%s' cmdline='%s' task="NPFMT"\n", |
| name, cmdLine, hTask ); |
| |
| return hTask; |
| } |
| |
| |
| /*********************************************************************** |
| * TASK_DeleteTask |
| */ |
| static void TASK_DeleteTask( HTASK hTask ) |
| { |
| TDB *pTask; |
| HANDLE hPDB; |
| |
| if (!(pTask = (TDB *)GlobalLock( hTask ))) return; |
| hPDB = pTask->hPDB; |
| |
| /* Free the task module */ |
| |
| FreeModule( pTask->hModule ); |
| |
| /* Close all open files of this task */ |
| |
| FILE_CloseAllFiles( pTask->hPDB ); |
| |
| /* Free the message queue */ |
| |
| QUEUE_DeleteMsgQueue( pTask->hQueue ); |
| |
| /* Free the selector aliases */ |
| |
| GLOBAL_FreeBlock( pTask->hCSAlias ); |
| GLOBAL_FreeBlock( pTask->hPDB ); |
| |
| /* Free the task structure itself */ |
| |
| GlobalFree( hTask ); |
| |
| /* Free all memory used by this task (including the 32-bit stack, */ |
| /* the environment block and the thunk segments). */ |
| |
| GlobalFreeAll( hPDB ); |
| } |
| |
| |
| /*********************************************************************** |
| * TASK_KillCurrentTask |
| * |
| * Kill the currently running task. As it's not possible to kill the |
| * current task like this, it is simply marked for destruction, and will |
| * be killed when either TASK_Reschedule or this function is called again |
| * in the context of another task. |
| */ |
| void TASK_KillCurrentTask( int exitCode ) |
| { |
| extern void EXEC_ExitWindows( int retCode ); |
| |
| if (hTaskToKill && (hTaskToKill != hCurrentTask)) |
| { |
| /* If another task is already marked for destruction, */ |
| /* we call kill it now, as we are in another context. */ |
| TASK_DeleteTask( hTaskToKill ); |
| } |
| |
| if (nTaskCount <= 1) |
| { |
| dprintf_task( stddeb, "Killing the last task, exiting\n" ); |
| EXEC_ExitWindows( 0 ); |
| } |
| |
| /* Remove the task from the list to be sure we never switch back to it */ |
| TASK_UnlinkTask( hCurrentTask ); |
| |
| hTaskToKill = hCurrentTask; |
| hLockedTask = 0; |
| |
| Yield(); |
| /* We should never return from this Yield() */ |
| |
| fprintf(stderr,"It's alive! Alive!!!\n"); |
| exit(1); |
| } |
| |
| |
| /*********************************************************************** |
| * TASK_Reschedule |
| * |
| * This is where all the magic of task-switching happens! |
| * |
| * This function should only be called via the TASK_SCHEDULE() macro, to make |
| * sure that all the context is saved correctly. |
| */ |
| void TASK_Reschedule(void) |
| { |
| TDB *pOldTask = NULL, *pNewTask; |
| HTASK hTask = 0; |
| |
| #ifdef CONFIG_IPC |
| dde_reschedule(); |
| #endif |
| /* First check if there's a task to kill */ |
| |
| if (hTaskToKill && (hTaskToKill != hCurrentTask)) |
| { |
| TASK_DeleteTask( hTaskToKill ); |
| hTaskToKill = 0; |
| } |
| |
| /* If current task is locked, simply return */ |
| |
| if (hLockedTask) return; |
| |
| /* Find a task to yield to */ |
| |
| pOldTask = (TDB *)GlobalLock( hCurrentTask ); |
| if (pOldTask && pOldTask->hYieldTo) |
| { |
| /* If a task is stored in hYieldTo of the current task (put there */ |
| /* by DirectedYield), yield to it only if it has events pending. */ |
| hTask = pOldTask->hYieldTo; |
| if (!(pNewTask = (TDB *)GlobalLock( hTask )) || !pNewTask->nEvents) |
| hTask = 0; |
| } |
| |
| if (!hTask) |
| { |
| hTask = hFirstTask; |
| while (hTask) |
| { |
| pNewTask = (TDB *)GlobalLock( hTask ); |
| if (pNewTask->nEvents && (hTask != hCurrentTask)) break; |
| hTask = pNewTask->hNext; |
| } |
| } |
| |
| /* If there's a task to kill, switch to any other task, */ |
| /* even if it doesn't have events pending. */ |
| |
| if (!hTask && hTaskToKill) hTask = hFirstTask; |
| |
| if (!hTask) return; /* Do nothing */ |
| |
| pNewTask = (TDB *)GlobalLock( hTask ); |
| dprintf_task( stddeb, "Switching to task "NPFMT" (%.8s)\n", |
| hTask, pNewTask->module_name ); |
| |
| /* Save the stacks of the previous task (if any) */ |
| |
| #ifndef WINELIB /* FIXME: JBP: IF1632 not allowed in libwine.a */ |
| if (pOldTask) |
| { |
| pOldTask->ss = IF1632_Saved16_ss; |
| pOldTask->sp = IF1632_Saved16_sp; |
| pOldTask->esp = IF1632_Saved32_esp; |
| } |
| else IF1632_Original32_esp = IF1632_Saved32_esp; |
| #endif |
| |
| /* Make the task the last in the linked list (round-robin scheduling) */ |
| |
| pNewTask->priority++; |
| TASK_UnlinkTask( hTask ); |
| TASK_LinkTask( hTask ); |
| pNewTask->priority--; |
| |
| /* Switch to the new stack */ |
| |
| hCurrentTask = hTask; |
| #ifndef WINELIB /* FIXME: JBP: IF1632 not allowed in libwine.a */ |
| IF1632_Saved16_ss = pNewTask->ss; |
| IF1632_Saved16_sp = pNewTask->sp; |
| IF1632_Saved32_esp = pNewTask->esp; |
| IF1632_Stack32_base = WIN16_GlobalLock( pNewTask->hStack32 ); |
| #endif |
| } |
| |
| |
| /*********************************************************************** |
| * InitTask (KERNEL.91) |
| */ |
| #ifdef WINELIB |
| void InitTask(void) |
| #else |
| void InitTask( struct sigcontext_struct context ) |
| #endif |
| { |
| static int firstTask = 1; |
| TDB *pTask; |
| NE_MODULE *pModule; |
| SEGTABLEENTRY *pSegTable; |
| INSTANCEDATA *pinstance; |
| LONG stacklow, stackhi; |
| |
| #ifndef WINELIB |
| EAX_reg(&context) = 0; |
| #endif |
| if (!(pTask = (TDB *)GlobalLock( hCurrentTask ))) return; |
| if (!(pModule = (NE_MODULE *)GlobalLock( pTask->hModule ))) return; |
| |
| if (firstTask) |
| { |
| extern BOOL WIDGETS_Init(void); |
| extern BOOL WIN_CreateDesktopWindow(void); |
| |
| /* Perform global initialisations that need a task context */ |
| |
| /* Initialize built-in window classes */ |
| if (!WIDGETS_Init()) return; |
| |
| /* Create desktop window */ |
| if (!WIN_CreateDesktopWindow()) return; |
| |
| firstTask = 0; |
| } |
| |
| #ifndef WINELIB |
| NE_InitializeDLLs( pTask->hModule ); |
| |
| /* Registers on return are: |
| * ax 1 if OK, 0 on error |
| * cx stack limit in bytes |
| * dx cmdShow parameter |
| * si instance handle of the previous instance |
| * di instance handle of the new task |
| * es:bx pointer to command-line inside PSP |
| */ |
| EAX_reg(&context) = 1; |
| EBX_reg(&context) = 0x81; |
| ECX_reg(&context) = pModule->stack_size; |
| EDX_reg(&context) = pTask->nCmdShow; |
| ESI_reg(&context) = (DWORD)pTask->hPrevInstance; |
| EDI_reg(&context) = (DWORD)pTask->hInstance; |
| ES_reg (&context) = (WORD)pTask->hPDB; |
| |
| /* Initialize the local heap */ |
| if ( pModule->heap_size ) |
| { |
| LocalInit( pTask->hInstance, 0, pModule->heap_size ); |
| } |
| #endif |
| |
| |
| /* Initialize the INSTANCEDATA structure */ |
| pSegTable = NE_SEG_TABLE( pModule ); |
| stacklow = pSegTable[pModule->ss - 1].minsize; |
| stackhi = stacklow + pModule->stack_size; |
| if (stackhi > 0xffff) stackhi = 0xffff; |
| pinstance = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN(CURRENT_DS, 0); |
| pinstance->stackbottom = stackhi; /* yup, that's right. Confused me too. */ |
| pinstance->stacktop = stacklow; |
| #ifndef WINELIB |
| pinstance->stackmin = IF1632_Saved16_sp; |
| #endif |
| } |
| |
| |
| /*********************************************************************** |
| * WaitEvent (KERNEL.30) |
| */ |
| BOOL WaitEvent( HTASK hTask ) |
| { |
| TDB *pTask; |
| |
| if (!hTask) hTask = hCurrentTask; |
| pTask = (TDB *)GlobalLock( hTask ); |
| if (pTask->nEvents > 0) |
| { |
| pTask->nEvents--; |
| return FALSE; |
| } |
| TASK_SCHEDULE(); |
| /* When we get back here, we have an event (or the task is the only one) */ |
| if (pTask->nEvents > 0) pTask->nEvents--; |
| return TRUE; |
| } |
| |
| |
| /*********************************************************************** |
| * PostEvent (KERNEL.31) |
| */ |
| void PostEvent( HTASK hTask ) |
| { |
| TDB *pTask; |
| |
| if (!hTask) hTask = hCurrentTask; |
| if (!(pTask = (TDB *)GlobalLock( hTask ))) return; |
| pTask->nEvents++; |
| } |
| |
| |
| /*********************************************************************** |
| * SetPriority (KERNEL.32) |
| */ |
| void SetPriority( HTASK hTask, int delta ) |
| { |
| TDB *pTask; |
| int newpriority; |
| |
| if (!hTask) hTask = hCurrentTask; |
| if (!(pTask = (TDB *)GlobalLock( hTask ))) return; |
| newpriority = pTask->priority + delta; |
| if (newpriority < -32) newpriority = -32; |
| else if (newpriority > 15) newpriority = 15; |
| |
| pTask->priority = newpriority + 1; |
| TASK_UnlinkTask( hTask ); |
| TASK_LinkTask( hTask ); |
| pTask->priority--; |
| } |
| |
| |
| /*********************************************************************** |
| * LockCurrentTask (KERNEL.33) |
| */ |
| HTASK LockCurrentTask( BOOL bLock ) |
| { |
| if (bLock) hLockedTask = hCurrentTask; |
| else hLockedTask = 0; |
| return hLockedTask; |
| } |
| |
| |
| /*********************************************************************** |
| * IsTaskLocked (KERNEL.122) |
| */ |
| HTASK IsTaskLocked(void) |
| { |
| return hLockedTask; |
| } |
| |
| |
| /*********************************************************************** |
| * OldYield (KERNEL.117) |
| */ |
| void OldYield(void) |
| { |
| TDB *pCurTask; |
| |
| pCurTask = (TDB *)GlobalLock( hCurrentTask ); |
| if (pCurTask) pCurTask->nEvents++; /* Make sure we get back here */ |
| TASK_SCHEDULE(); |
| if (pCurTask) pCurTask->nEvents--; |
| } |
| |
| |
| /*********************************************************************** |
| * DirectedYield (KERNEL.150) |
| */ |
| void DirectedYield( HTASK hTask ) |
| { |
| TDB *pCurTask; |
| |
| if ((pCurTask = (TDB *)GlobalLock( hCurrentTask )) != NULL) |
| pCurTask->hYieldTo = hTask; |
| |
| OldYield(); |
| } |
| |
| |
| /*********************************************************************** |
| * Yield (KERNEL.29) |
| */ |
| void Yield(void) |
| { |
| DirectedYield( 0 ); |
| } |
| |
| |
| /*********************************************************************** |
| * MakeProcInstance (KERNEL.51) |
| */ |
| FARPROC MakeProcInstance( FARPROC func, HANDLE hInstance ) |
| { |
| #ifdef WINELIB32 |
| return func; /* func can be called directly in Win32 */ |
| #else |
| BYTE *thunk; |
| SEGPTR thunkaddr; |
| |
| thunkaddr = TASK_AllocThunk( hCurrentTask ); |
| if (!thunkaddr) return (FARPROC)0; |
| thunk = PTR_SEG_TO_LIN( thunkaddr ); |
| |
| dprintf_task( stddeb, "MakeProcInstance("SPFMT","NPFMT"): got thunk "SPFMT"\n", |
| (SEGPTR)func, hInstance, (SEGPTR)thunkaddr ); |
| |
| *thunk++ = 0xb8; /* movw instance, %ax */ |
| *thunk++ = (BYTE)(hInstance & 0xff); |
| *thunk++ = (BYTE)(hInstance >> 8); |
| *thunk++ = 0xea; /* ljmp func */ |
| *(DWORD *)thunk = (DWORD)func; |
| return (FARPROC)thunkaddr; |
| #endif |
| } |
| |
| |
| /*********************************************************************** |
| * FreeProcInstance (KERNEL.52) |
| */ |
| void FreeProcInstance( FARPROC func ) |
| { |
| #ifndef WINELIB32 |
| dprintf_task( stddeb, "FreeProcInstance("SPFMT")\n", (SEGPTR)func ); |
| TASK_FreeThunk( hCurrentTask, (SEGPTR)func ); |
| #endif |
| } |
| |
| |
| /********************************************************************** |
| * GetCodeHandle (KERNEL.93) |
| */ |
| HANDLE GetCodeHandle( FARPROC proc ) |
| { |
| HANDLE handle; |
| BYTE *thunk = (BYTE *)PTR_SEG_TO_LIN( proc ); |
| |
| /* Return the code segment containing 'proc'. */ |
| /* Not sure if this is really correct (shouldn't matter that much). */ |
| |
| /* Check if it is really a thunk */ |
| if ((thunk[0] == 0xb8) && (thunk[3] == 0xea)) |
| handle = GlobalHandle( thunk[6] + (thunk[7] << 8) ); |
| else |
| handle = GlobalHandle( HIWORD(proc) ); |
| |
| return handle; |
| } |
| |
| |
| /*********************************************************************** |
| * SetTaskQueue (KERNEL.34) |
| */ |
| HQUEUE SetTaskQueue( HANDLE hTask, HQUEUE hQueue ) |
| { |
| HQUEUE hPrev; |
| TDB *pTask; |
| |
| if (!hTask) hTask = hCurrentTask; |
| if (!(pTask = (TDB *)GlobalLock( hTask ))) return 0; |
| hPrev = pTask->hQueue; |
| pTask->hQueue = hQueue; |
| return hPrev; |
| } |
| |
| |
| /*********************************************************************** |
| * GetTaskQueue (KERNEL.35) |
| */ |
| HQUEUE GetTaskQueue( HANDLE hTask ) |
| { |
| TDB *pTask; |
| |
| if (!hTask) hTask = hCurrentTask; |
| if (!(pTask = (TDB *)GlobalLock( hTask ))) return 0; |
| return pTask->hQueue; |
| } |
| |
| |
| /*********************************************************************** |
| * GetTaskQueueDS (KERNEL.118) |
| */ |
| #ifndef WINELIB |
| void GetTaskQueueDS( struct sigcontext_struct context ) |
| { |
| DS_reg(&context) = GlobalHandleToSel( GetTaskQueue(0) ); |
| } |
| #endif /* WINELIB */ |
| |
| |
| /*********************************************************************** |
| * GetTaskQueueES (KERNEL.119) |
| */ |
| #ifndef WINELIB |
| void GetTaskQueueES( struct sigcontext_struct context ) |
| { |
| ES_reg(&context) = GlobalHandleToSel( GetTaskQueue(0) ); |
| } |
| #endif /* WINELIB */ |
| |
| |
| /*********************************************************************** |
| * GetCurrentTask (KERNEL.36) |
| */ |
| HTASK GetCurrentTask(void) |
| { |
| /* Undocumented: first task is returned in high word */ |
| #ifdef WINELIB32 |
| return hCurrentTask; |
| #else |
| return MAKELONG( hCurrentTask, hFirstTask ); |
| #endif |
| } |
| |
| |
| /*********************************************************************** |
| * GetCurrentPDB (KERNEL.37) |
| */ |
| HANDLE GetCurrentPDB(void) |
| { |
| TDB *pTask; |
| |
| if (!(pTask = (TDB *)GlobalLock( hCurrentTask ))) return 0; |
| return pTask->hPDB; |
| } |
| |
| |
| /*********************************************************************** |
| * GetInstanceData (KERNEL.54) |
| */ |
| int GetInstanceData( HANDLE instance, WORD buffer, int len ) |
| { |
| char *ptr = (char *)GlobalLock( instance ); |
| if (!ptr || !len) return 0; |
| if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer; |
| memcpy( ptr + buffer, (char *)GlobalLock( CURRENT_DS ) + buffer, len ); |
| return len; |
| } |
| |
| |
| /*********************************************************************** |
| * SetErrorMode (KERNEL.107) |
| */ |
| UINT SetErrorMode( UINT mode ) |
| { |
| TDB *pTask; |
| UINT oldMode; |
| |
| if (!(pTask = (TDB *)GlobalLock( hCurrentTask ))) return 0; |
| oldMode = pTask->error_mode; |
| pTask->error_mode = mode; |
| return oldMode; |
| } |
| |
| |
| /*********************************************************************** |
| * GetDOSEnvironment (KERNEL.131) |
| */ |
| SEGPTR GetDOSEnvironment(void) |
| { |
| TDB *pTask; |
| |
| if (!(pTask = (TDB *)GlobalLock( hCurrentTask ))) return 0; |
| return (SEGPTR)WIN16_GlobalLock( pTask->pdb.environment ); |
| } |
| |
| |
| /*********************************************************************** |
| * GetNumTasks (KERNEL.152) |
| */ |
| WORD GetNumTasks(void) |
| { |
| return nTaskCount; |
| } |
| |
| |
| /*********************************************************************** |
| * GetTaskDS (KERNEL.155) |
| */ |
| HINSTANCE GetTaskDS(void) |
| { |
| TDB *pTask; |
| |
| if (!(pTask = (TDB *)GlobalLock( hCurrentTask ))) return 0; |
| return pTask->hInstance; |
| } |
| |
| |
| /*********************************************************************** |
| * IsTask (KERNEL.320) |
| */ |
| BOOL IsTask( HTASK hTask ) |
| { |
| TDB *pTask; |
| |
| if (!(pTask = (TDB *)GlobalLock( hTask ))) return FALSE; |
| if (GlobalSize( hTask ) < sizeof(TDB)) return FALSE; |
| return (pTask->magic == TDB_MAGIC); |
| } |
| |
| |
| /*********************************************************************** |
| * GetExePtr (KERNEL.133) |
| */ |
| HMODULE GetExePtr( HANDLE handle ) |
| { |
| char *ptr; |
| HTASK hTask; |
| HANDLE owner; |
| |
| /* Check for module handle */ |
| |
| if (!(ptr = GlobalLock( handle ))) return 0; |
| if (((NE_MODULE *)ptr)->magic == NE_SIGNATURE) return handle; |
| /* Fake modules describing PE modules have a PE signature */ |
| if (((NE_MODULE *)ptr)->magic == PE_SIGNATURE) return handle; |
| |
| /* Check the owner for module handle */ |
| |
| #ifndef WINELIB |
| owner = FarGetOwner( handle ); |
| #else |
| owner = NULL; |
| #endif |
| if (!(ptr = GlobalLock( owner ))) return 0; |
| if (((NE_MODULE *)ptr)->magic == NE_SIGNATURE) return owner; |
| if (((NE_MODULE *)ptr)->magic == PE_SIGNATURE) return owner; |
| |
| /* Search for this handle and its owner inside all tasks */ |
| |
| hTask = hFirstTask; |
| while (hTask) |
| { |
| TDB *pTask = (TDB *)GlobalLock( hTask ); |
| if ((hTask == handle) || |
| (pTask->hInstance == handle) || |
| (pTask->hQueue == handle) || |
| (pTask->hPDB == handle)) return pTask->hModule; |
| if ((hTask == owner) || |
| (pTask->hInstance == owner) || |
| (pTask->hQueue == owner) || |
| (pTask->hPDB == owner)) return pTask->hModule; |
| hTask = pTask->hNext; |
| } |
| return 0; |
| } |
| |
| |
| /*********************************************************************** |
| * TaskFirst (TOOLHELP.63) |
| */ |
| BOOL TaskFirst( TASKENTRY *lpte ) |
| { |
| lpte->hNext = hFirstTask; |
| return TaskNext( lpte ); |
| } |
| |
| |
| /*********************************************************************** |
| * TaskNext (TOOLHELP.64) |
| */ |
| BOOL TaskNext( TASKENTRY *lpte ) |
| { |
| TDB *pTask; |
| INSTANCEDATA *pInstData; |
| |
| dprintf_toolhelp( stddeb, "TaskNext(%p): task="NPFMT"\n", lpte, lpte->hNext ); |
| if (!lpte->hNext) return FALSE; |
| pTask = (TDB *)GlobalLock( lpte->hNext ); |
| if (!pTask || pTask->magic != TDB_MAGIC) return FALSE; |
| pInstData = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN( pTask->hInstance, 0 ); |
| lpte->hTask = lpte->hNext; |
| lpte->hTaskParent = pTask->hParent; |
| lpte->hInst = pTask->hInstance; |
| lpte->hModule = pTask->hModule; |
| lpte->wSS = pTask->ss; |
| lpte->wSP = pTask->sp; |
| lpte->wStackTop = pInstData->stacktop; |
| lpte->wStackMinimum = pInstData->stackmin; |
| lpte->wStackBottom = pInstData->stackbottom; |
| lpte->wcEvents = pTask->nEvents; |
| lpte->hQueue = pTask->hQueue; |
| strncpy( lpte->szModule, pTask->module_name, 8 ); |
| lpte->szModule[8] = '\0'; |
| lpte->wPSPOffset = 0x100; /*??*/ |
| lpte->hNext = pTask->hNext; |
| return TRUE; |
| } |
| |
| |
| /*********************************************************************** |
| * TaskFindHandle (TOOLHELP.65) |
| */ |
| BOOL TaskFindHandle( TASKENTRY *lpte, HTASK hTask ) |
| { |
| lpte->hNext = hTask; |
| return TaskNext( lpte ); |
| } |