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gcc/boehm-gc/win32_threads.c
Adam Megacz 3e0e6811b6 Makefile.am: Added win32_threads.c to sources list. 
2002-02-24  Adam Megacz  <adam@xwt.org>

        * Makefile.am: Added win32_threads.c to sources list.
        * win32_threads.c: Added two */'s which I had neglected.

From-SVN: r50016
2002-02-25 04:04:43 +00:00

631 lines
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#if defined(GC_WIN32_THREADS)
#include "private/gc_priv.h"
#if 0
#define STRICT
#include <windows.h>
#endif
#define MAX_THREADS 64
struct thread_entry {
LONG in_use;
DWORD id;
HANDLE handle;
void *stack; /* The cold end of the stack. */
/* 0 ==> entry not valid. */
/* !in_use ==> stack == 0 */
CONTEXT context;
GC_bool suspended;
};
volatile GC_bool GC_please_stop = FALSE;
volatile struct thread_entry thread_table[MAX_THREADS];
void GC_push_thread_structures GC_PROTO((void))
{
/* Unlike the other threads implementations, the thread table here */
/* contains no pointers to the collectable heap. Thus we have */
/* no private structures we need to preserve. */
}
void GC_stop_world()
{
DWORD thread_id = GetCurrentThreadId();
int i;
GC_please_stop = TRUE;
for (i = 0; i < MAX_THREADS; i++)
if (thread_table[i].stack != 0
&& thread_table[i].id != thread_id) {
# ifdef MSWINCE
/* SuspendThread will fail if thread is running kernel code */
while (SuspendThread(thread_table[i].handle) == (DWORD)-1)
Sleep(10);
# else
/* Apparently the Windows 95 GetOpenFileName call creates */
/* a thread that does not properly get cleaned up, and */
/* SuspendThread on its descriptor may provoke a crash. */
/* This reduces the probability of that event, though it still */
/* appears there's a race here. */
DWORD exitCode;
if (GetExitCodeThread(thread_table[i].handle,&exitCode) &&
exitCode != STILL_ACTIVE) {
thread_table[i].stack = 0;
thread_table[i].in_use = FALSE;
CloseHandle(thread_table[i].handle);
BZERO((void *)(&thread_table[i].context), sizeof(CONTEXT));
continue;
}
if (SuspendThread(thread_table[i].handle) == (DWORD)-1)
ABORT("SuspendThread failed");
# endif
thread_table[i].suspended = TRUE;
}
}
void GC_start_world()
{
DWORD thread_id = GetCurrentThreadId();
int i;
for (i = 0; i < MAX_THREADS; i++)
if (thread_table[i].stack != 0 && thread_table[i].suspended
&& thread_table[i].id != thread_id) {
if (ResumeThread(thread_table[i].handle) == (DWORD)-1)
ABORT("ResumeThread failed");
thread_table[i].suspended = FALSE;
}
GC_please_stop = FALSE;
}
# ifdef _MSC_VER
# pragma warning(disable:4715)
# endif
ptr_t GC_current_stackbottom()
{
DWORD thread_id = GetCurrentThreadId();
int i;
for (i = 0; i < MAX_THREADS; i++)
if (thread_table[i].stack && thread_table[i].id == thread_id)
return thread_table[i].stack;
ABORT("no thread table entry for current thread");
}
# ifdef _MSC_VER
# pragma warning(default:4715)
# endif
# ifdef MSWINCE
/* The VirtualQuery calls below won't work properly on WinCE, but */
/* since each stack is restricted to an aligned 64K region of */
/* virtual memory we can just take the next lowest multiple of 64K. */
# define GC_get_lo_stack_addr(s) \
((ptr_t)(((DWORD)(s) - 1) & 0xFFFF0000))
# else
static ptr_t GC_get_lo_stack_addr(ptr_t s)
{
ptr_t bottom;
MEMORY_BASIC_INFORMATION info;
VirtualQuery(s, &info, sizeof(info));
do {
bottom = info.BaseAddress;
VirtualQuery(bottom - 1, &info, sizeof(info));
} while ((info.Protect & PAGE_READWRITE)
&& !(info.Protect & PAGE_GUARD));
return(bottom);
}
# endif
void GC_push_all_stacks()
{
DWORD thread_id = GetCurrentThreadId();
int i;
for (i = 0; i < MAX_THREADS; i++)
if (thread_table[i].stack) {
ptr_t bottom = GC_get_lo_stack_addr(thread_table[i].stack);
if (thread_table[i].id == thread_id)
GC_push_all_stack((ptr_t)&i, thread_table[i].stack);
else {
thread_table[i].context.ContextFlags
= (CONTEXT_INTEGER|CONTEXT_CONTROL);
if (!GetThreadContext(thread_table[i].handle,
/* cast away volatile qualifier */
(LPCONTEXT)&thread_table[i].context))
ABORT("GetThreadContext failed");
# ifdef I386
if (thread_table[i].context.Esp >= (DWORD)thread_table[i].stack
|| thread_table[i].context.Esp < (DWORD)bottom)
ABORT("Thread stack pointer out of range");
GC_push_one ((word) thread_table[i].context.Edi);
GC_push_one ((word) thread_table[i].context.Esi);
GC_push_one ((word) thread_table[i].context.Ebp);
GC_push_one ((word) thread_table[i].context.Ebx);
GC_push_one ((word) thread_table[i].context.Edx);
GC_push_one ((word) thread_table[i].context.Ecx);
GC_push_one ((word) thread_table[i].context.Eax);
GC_push_all_stack((char *) thread_table[i].context.Esp,
thread_table[i].stack);
# else
# ifdef ARM32
if (thread_table[i].context.Sp >= (DWORD)thread_table[i].stack
|| thread_table[i].context.Sp < (DWORD)bottom)
ABORT("Thread stack pointer out of range");
GC_push_one ((word) thread_table[i].context.R0);
GC_push_one ((word) thread_table[i].context.R1);
GC_push_one ((word) thread_table[i].context.R2);
GC_push_one ((word) thread_table[i].context.R3);
GC_push_one ((word) thread_table[i].context.R4);
GC_push_one ((word) thread_table[i].context.R5);
GC_push_one ((word) thread_table[i].context.R6);
GC_push_one ((word) thread_table[i].context.R7);
GC_push_one ((word) thread_table[i].context.R8);
GC_push_one ((word) thread_table[i].context.R9);
GC_push_one ((word) thread_table[i].context.R10);
GC_push_one ((word) thread_table[i].context.R11);
GC_push_one ((word) thread_table[i].context.R12);
GC_push_all_stack((char *) thread_table[i].context.Sp,
thread_table[i].stack);
# else
# ifdef SHx
if (thread_table[i].context.R15 >= (DWORD)thread_table[i].stack
|| thread_table[i].context.R15 < (DWORD)bottom)
ABORT("Thread stack pointer out of range");
GC_push_one ((word) thread_table[i].context.R0);
GC_push_one ((word) thread_table[i].context.R1);
GC_push_one ((word) thread_table[i].context.R2);
GC_push_one ((word) thread_table[i].context.R3);
GC_push_one ((word) thread_table[i].context.R4);
GC_push_one ((word) thread_table[i].context.R5);
GC_push_one ((word) thread_table[i].context.R6);
GC_push_one ((word) thread_table[i].context.R7);
GC_push_one ((word) thread_table[i].context.R8);
GC_push_one ((word) thread_table[i].context.R9);
GC_push_one ((word) thread_table[i].context.R10);
GC_push_one ((word) thread_table[i].context.R11);
GC_push_one ((word) thread_table[i].context.R12);
GC_push_one ((word) thread_table[i].context.R13);
GC_push_one ((word) thread_table[i].context.R14);
GC_push_all_stack((char *) thread_table[i].context.R15,
thread_table[i].stack);
# else
# ifdef MIPS
if (thread_table[i].context.IntSp >= (DWORD)thread_table[i].stack
|| thread_table[i].context.IntSp < (DWORD)bottom)
ABORT("Thread stack pointer out of range");
GC_push_one ((word) thread_table[i].context.IntAt);
GC_push_one ((word) thread_table[i].context.IntV0);
GC_push_one ((word) thread_table[i].context.IntV1);
GC_push_one ((word) thread_table[i].context.IntA0);
GC_push_one ((word) thread_table[i].context.IntA1);
GC_push_one ((word) thread_table[i].context.IntA2);
GC_push_one ((word) thread_table[i].context.IntA3);
GC_push_one ((word) thread_table[i].context.IntT0);
GC_push_one ((word) thread_table[i].context.IntT1);
GC_push_one ((word) thread_table[i].context.IntT2);
GC_push_one ((word) thread_table[i].context.IntT3);
GC_push_one ((word) thread_table[i].context.IntT4);
GC_push_one ((word) thread_table[i].context.IntT5);
GC_push_one ((word) thread_table[i].context.IntT6);
GC_push_one ((word) thread_table[i].context.IntT7);
GC_push_one ((word) thread_table[i].context.IntS0);
GC_push_one ((word) thread_table[i].context.IntS1);
GC_push_one ((word) thread_table[i].context.IntS2);
GC_push_one ((word) thread_table[i].context.IntS3);
GC_push_one ((word) thread_table[i].context.IntS4);
GC_push_one ((word) thread_table[i].context.IntS5);
GC_push_one ((word) thread_table[i].context.IntS6);
GC_push_one ((word) thread_table[i].context.IntS7);
GC_push_one ((word) thread_table[i].context.IntT8);
GC_push_one ((word) thread_table[i].context.IntT9);
GC_push_one ((word) thread_table[i].context.IntK0);
GC_push_one ((word) thread_table[i].context.IntK1);
GC_push_one ((word) thread_table[i].context.IntS8);
GC_push_all_stack((char *) thread_table[i].context.IntSp,
thread_table[i].stack);
# else
# ifdef PPC
if (thread_table[i].context.Gpr1 >= (DWORD)thread_table[i].stack
|| thread_table[i].context.Gpr1 < (DWORD)bottom)
ABORT("Thread stack pointer out of range");
GC_push_one ((word) thread_table[i].context.Gpr0);
/* Gpr1 is stack pointer */
/* Gpr2 is global pointer */
GC_push_one ((word) thread_table[i].context.Gpr3);
GC_push_one ((word) thread_table[i].context.Gpr4);
GC_push_one ((word) thread_table[i].context.Gpr5);
GC_push_one ((word) thread_table[i].context.Gpr6);
GC_push_one ((word) thread_table[i].context.Gpr7);
GC_push_one ((word) thread_table[i].context.Gpr8);
GC_push_one ((word) thread_table[i].context.Gpr9);
GC_push_one ((word) thread_table[i].context.Gpr10);
GC_push_one ((word) thread_table[i].context.Gpr11);
GC_push_one ((word) thread_table[i].context.Gpr12);
/* Gpr13 is reserved for the kernel */
GC_push_one ((word) thread_table[i].context.Gpr14);
GC_push_one ((word) thread_table[i].context.Gpr15);
GC_push_one ((word) thread_table[i].context.Gpr16);
GC_push_one ((word) thread_table[i].context.Gpr17);
GC_push_one ((word) thread_table[i].context.Gpr18);
GC_push_one ((word) thread_table[i].context.Gpr19);
GC_push_one ((word) thread_table[i].context.Gpr20);
GC_push_one ((word) thread_table[i].context.Gpr21);
GC_push_one ((word) thread_table[i].context.Gpr22);
GC_push_one ((word) thread_table[i].context.Gpr23);
GC_push_one ((word) thread_table[i].context.Gpr24);
GC_push_one ((word) thread_table[i].context.Gpr25);
GC_push_one ((word) thread_table[i].context.Gpr26);
GC_push_one ((word) thread_table[i].context.Gpr27);
GC_push_one ((word) thread_table[i].context.Gpr28);
GC_push_one ((word) thread_table[i].context.Gpr29);
GC_push_one ((word) thread_table[i].context.Gpr30);
GC_push_one ((word) thread_table[i].context.Gpr31);
GC_push_all_stack((char *) thread_table[i].context.Gpr1,
thread_table[i].stack);
# else
# ifdef ALPHA
if (thread_table[i].context.IntSp >= (DWORD)thread_table[i].stack
|| thread_table[i].context.IntSp < (DWORD)bottom)
ABORT("Thread stack pointer out of range");
GC_push_one ((word) thread_table[i].context.IntV0);
GC_push_one ((word) thread_table[i].context.IntT0);
GC_push_one ((word) thread_table[i].context.IntT1);
GC_push_one ((word) thread_table[i].context.IntT2);
GC_push_one ((word) thread_table[i].context.IntT3);
GC_push_one ((word) thread_table[i].context.IntT4);
GC_push_one ((word) thread_table[i].context.IntT5);
GC_push_one ((word) thread_table[i].context.IntT6);
GC_push_one ((word) thread_table[i].context.IntT7);
GC_push_one ((word) thread_table[i].context.IntS0);
GC_push_one ((word) thread_table[i].context.IntS1);
GC_push_one ((word) thread_table[i].context.IntS2);
GC_push_one ((word) thread_table[i].context.IntS3);
GC_push_one ((word) thread_table[i].context.IntS4);
GC_push_one ((word) thread_table[i].context.IntS5);
GC_push_one ((word) thread_table[i].context.IntFp);
GC_push_one ((word) thread_table[i].context.IntA0);
GC_push_one ((word) thread_table[i].context.IntA1);
GC_push_one ((word) thread_table[i].context.IntA2);
GC_push_one ((word) thread_table[i].context.IntA3);
GC_push_one ((word) thread_table[i].context.IntA4);
GC_push_one ((word) thread_table[i].context.IntA5);
GC_push_one ((word) thread_table[i].context.IntT8);
GC_push_one ((word) thread_table[i].context.IntT9);
GC_push_one ((word) thread_table[i].context.IntT10);
GC_push_one ((word) thread_table[i].context.IntT11);
GC_push_one ((word) thread_table[i].context.IntT12);
GC_push_one ((word) thread_table[i].context.IntAt);
GC_push_all_stack((char *) thread_table[i].context.IntSp,
thread_table[i].stack);
# else
--> architecture not supported
# endif /* !ALPHA */
# endif /* !PPC */
# endif /* !MIPS */
# endif /* !SHx */
# endif /* !ARM32 */
# endif /* !I386 */
}
}
}
void GC_get_next_stack(char *start, char **lo, char **hi)
{
int i;
# define ADDR_LIMIT (char *)(-1L)
char * current_min = ADDR_LIMIT;
for (i = 0; i < MAX_THREADS; i++) {
char * s = (char *)thread_table[i].stack;
if (0 != s && s > start && s < current_min) {
current_min = s;
}
}
*hi = current_min;
if (current_min == ADDR_LIMIT) {
*lo = ADDR_LIMIT;
return;
}
*lo = GC_get_lo_stack_addr(current_min);
if (*lo < start) *lo = start;
}
#if !defined(MSWINCE) && !(defined(__MINGW32__) && !defined(_DLL))
HANDLE WINAPI GC_CreateThread(
LPSECURITY_ATTRIBUTES lpThreadAttributes,
DWORD dwStackSize, LPTHREAD_START_ROUTINE lpStartAddress,
LPVOID lpParameter, DWORD dwCreationFlags, LPDWORD lpThreadId )
{
return CreateThread(lpThreadAttributes, dwStackSize, lpStartAddress,
lpParameter, dwCreationFlags, lpThreadId);
}
#else /* !defined(MSWINCE) && !(defined(__MINGW32__) && !defined(_DLL)) */
typedef struct {
HANDLE child_ready_h, parent_ready_h;
volatile struct thread_entry * entry;
LPTHREAD_START_ROUTINE start;
LPVOID param;
} thread_args;
DWORD WINAPI thread_start(LPVOID arg);
HANDLE WINAPI GC_CreateThread(
LPSECURITY_ATTRIBUTES lpThreadAttributes,
DWORD dwStackSize, LPTHREAD_START_ROUTINE lpStartAddress,
LPVOID lpParameter, DWORD dwCreationFlags, LPDWORD lpThreadId )
{
HANDLE thread_h = NULL;
HANDLE child_ready_h, parent_ready_h;
int i;
thread_args args;
/* allocate thread slot */
LOCK();
for (i = 0; i != MAX_THREADS && thread_table[i].in_use; i++)
;
if (i != MAX_THREADS) {
thread_table[i].in_use = TRUE;
}
UNLOCK();
if (i != MAX_THREADS) {
/* create unnamed unsignalled events */
if (child_ready_h = CreateEvent(NULL, FALSE, FALSE, NULL)) {
if (parent_ready_h = CreateEvent(NULL, FALSE, FALSE, NULL)) {
/* set up thread arguments */
args.child_ready_h = child_ready_h;
args.parent_ready_h = parent_ready_h;
args.entry = &thread_table[i];
args.start = lpStartAddress;
args.param = lpParameter;
thread_h = CreateThread(lpThreadAttributes,
dwStackSize, thread_start,
&args,
dwCreationFlags & ~CREATE_SUSPENDED,
lpThreadId);
if (thread_h) {
/* fill in ID and handle; tell child this is done */
thread_table[i].id = *lpThreadId;
thread_table[i].handle = thread_h;
SetEvent (parent_ready_h);
/* wait for child to fill in stack and copy args */
WaitForSingleObject (child_ready_h, INFINITE);
/* suspend the child if requested */
if (dwCreationFlags & CREATE_SUSPENDED)
SuspendThread (thread_h);
/* let child call given function now (or when resumed) */
SetEvent (parent_ready_h);
} else {
CloseHandle (parent_ready_h);
}
}
}
CloseHandle (child_ready_h);
if (thread_h == NULL)
thread_table[i].in_use = FALSE;
} else { /* no thread slot found */
SetLastError (ERROR_TOO_MANY_TCBS);
}
return thread_h;
}
static DWORD WINAPI thread_start(LPVOID arg)
{
DWORD ret = 0;
thread_args args = *(thread_args *)arg;
/* wait for parent to fill in ID and handle */
WaitForSingleObject (args.parent_ready_h, INFINITE);
ResetEvent (args.parent_ready_h);
/* fill in stack; tell parent this is done */
args.entry->stack = GC_get_stack_base();
SetEvent (args.child_ready_h);
/* wait for parent to tell us to go (in case it needs to suspend us) */
WaitForSingleObject (args.parent_ready_h, INFINITE);
CloseHandle (args.parent_ready_h);
/* Clear the thread entry even if we exit with an exception. */
/* This is probably pointless, since an uncaught exception is */
/* supposed to result in the process being killed. */
__try {
ret = args.start (args.param);
} __finally {
LOCK();
args.entry->stack = 0;
args.entry->in_use = FALSE;
/* cast away volatile qualifier */
BZERO((void *) &args.entry->context, sizeof(CONTEXT));
UNLOCK();
}
return ret;
}
#endif /* !defined(MSWINCE) && !(defined(__MINGW32__) && !defined(_DLL)) */
#ifdef MSWINCE
typedef struct {
HINSTANCE hInstance;
HINSTANCE hPrevInstance;
LPWSTR lpCmdLine;
int nShowCmd;
} main_thread_args;
DWORD WINAPI main_thread_start(LPVOID arg);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPWSTR lpCmdLine, int nShowCmd)
{
DWORD exit_code = 1;
main_thread_args args = {
hInstance, hPrevInstance, lpCmdLine, nShowCmd
};
HANDLE thread_h;
DWORD thread_id;
/* initialize everything */
InitializeCriticalSection(&GC_allocate_ml);
GC_init();
/* start the main thread */
thread_h = GC_CreateThread(
NULL, 0, main_thread_start, &args, 0, &thread_id);
if (thread_h != NULL)
{
WaitForSingleObject (thread_h, INFINITE);
GetExitCodeThread (thread_h, &exit_code);
CloseHandle (thread_h);
}
GC_deinit();
DeleteCriticalSection(&GC_allocate_ml);
return (int) exit_code;
}
DWORD WINAPI main_thread_start(LPVOID arg)
{
main_thread_args * args = (main_thread_args *) arg;
return (DWORD) GC_WinMain (args->hInstance, args->hPrevInstance,
args->lpCmdLine, args->nShowCmd);
}
# else /* !MSWINCE */
LONG WINAPI GC_write_fault_handler(struct _EXCEPTION_POINTERS *exc_info);
/*
* This isn't generally safe, since DllMain is not premptible.
* If another thread holds the lock while this runs we're in trouble.
* Pontus Rydin suggests wrapping the thread start routine instead.
*/
BOOL WINAPI DllMain(HINSTANCE inst, ULONG reason, LPVOID reserved)
{
switch (reason) {
case DLL_PROCESS_ATTACH:
InitializeCriticalSection(&GC_allocate_ml);
GC_init(); /* Force initialization before thread attach. */
/* fall through */
case DLL_THREAD_ATTACH:
{
int i;
/* It appears to be unsafe to acquire a lock here, since this */
/* code is apparently not preeemptible on some systems. */
/* (This is based on complaints, not on Microsoft's official */
/* documentation, which says this should perform "only simple */
/* inititalization tasks".) */
/* Hence we make do with nonblocking synchronization. */
/* The following should be a noop according to the win32 */
/* documentation. There is empirical evidence that it */
/* isn't. - HB */
# ifdef MPROTECT_VDB
if (GC_incremental) SetUnhandledExceptionFilter(GC_write_fault_handler);
# endif
for (i = 0;
/* cast away volatile qualifier */
InterlockedExchange((LPLONG) &thread_table[i].in_use, 1) != 0;
i++) {
/* Compare-and-swap would make this cleaner, but that's not */
/* supported before Windows 98 and NT 4.0. In Windows 2000, */
/* InterlockedExchange is supposed to be replaced by */
/* InterlockedExchangePointer, but that's not really what I */
/* want here. */
if (i == MAX_THREADS - 1)
ABORT("too many threads");
}
thread_table[i].id = GetCurrentThreadId();
if (!DuplicateHandle(GetCurrentProcess(),
GetCurrentThread(),
GetCurrentProcess(),
/* cast away volatile qualifier */
(HANDLE *) &thread_table[i].handle,
0,
0,
DUPLICATE_SAME_ACCESS)) {
DWORD last_error = GetLastError();
GC_printf1("Last error code: %lx\n", last_error);
ABORT("DuplicateHandle failed");
}
thread_table[i].stack = GC_get_stack_base();
/* If this thread is being created while we are trying to stop */
/* the world, wait here. Hopefully this can't happen on any */
/* systems that don't allow us to block here. */
while (GC_please_stop) Sleep(20);
}
break;
case DLL_THREAD_DETACH:
{
int i;
DWORD thread_id = GetCurrentThreadId();
LOCK();
for (i = 0;
i < MAX_THREADS &&
(thread_table[i].stack == 0 || thread_table[i].id != thread_id);
i++) {}
if (i >= MAX_THREADS) {
WARN("thread %ld not found on detach", (GC_word)thread_id);
} else {
thread_table[i].stack = 0;
thread_table[i].in_use = FALSE;
CloseHandle(thread_table[i].handle);
/* cast away volatile qualifier */
BZERO((void *) &thread_table[i].context, sizeof(CONTEXT));
}
UNLOCK();
}
break;
case DLL_PROCESS_DETACH:
{
int i;
LOCK();
for (i = 0; i < MAX_THREADS; ++i)
{
if (thread_table[i].in_use)
{
thread_table[i].stack = 0;
thread_table[i].in_use = FALSE;
CloseHandle(thread_table[i].handle);
BZERO((void *) &thread_table[i].context, sizeof(CONTEXT));
}
}
UNLOCK();
GC_deinit();
DeleteCriticalSection(&GC_allocate_ml);
}
break;
}
return TRUE;
}
# endif /* !MSWINCE */
#endif /* GC_WIN32_THREADS */
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