mirror of
https://github.com/rn10950/RetroZilla.git
synced 2024-08-30 17:40:16 +02:00
210 lines
6.1 KiB
C
210 lines
6.1 KiB
C
|
#ifdef WIN32_THREADS
|
||
|
|
||
|
#include "gc_priv.h"
|
||
|
|
||
|
#define STRICT
|
||
|
#include <windows.h>
|
||
|
|
||
|
#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_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) {
|
||
|
if (SuspendThread(thread_table[i].handle) == (DWORD)-1)
|
||
|
ABORT("SuspendThread failed");
|
||
|
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;
|
||
|
}
|
||
|
|
||
|
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");
|
||
|
}
|
||
|
|
||
|
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);
|
||
|
}
|
||
|
|
||
|
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(&i, thread_table[i].stack);
|
||
|
else {
|
||
|
thread_table[i].context.ContextFlags
|
||
|
= (CONTEXT_INTEGER|CONTEXT_CONTROL);
|
||
|
if (!GetThreadContext(thread_table[i].handle,
|
||
|
&thread_table[i].context))
|
||
|
ABORT("GetThreadContext failed");
|
||
|
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.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(thread_table[i].context.Esp, thread_table[i].stack);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
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;
|
||
|
}
|
||
|
|
||
|
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 */
|
||
|
# ifndef SMALL_CONFIG
|
||
|
if (GC_incremental) SetUnhandledExceptionFilter(GC_write_fault_handler);
|
||
|
# endif
|
||
|
|
||
|
for (i = 0; InterlockedExchange(&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(),
|
||
|
&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_PROCESS_DETACH:
|
||
|
case DLL_THREAD_DETACH:
|
||
|
{
|
||
|
int i;
|
||
|
DWORD thread_id = GetCurrentThreadId();
|
||
|
LOCK();
|
||
|
for (i = 0;
|
||
|
thread_table[i].stack == 0 || thread_table[i].id != thread_id;
|
||
|
i++) {
|
||
|
if (i == MAX_THREADS - 1)
|
||
|
ABORT("thread not found on detach");
|
||
|
}
|
||
|
thread_table[i].stack = 0;
|
||
|
thread_table[i].in_use = FALSE;
|
||
|
CloseHandle(thread_table[i].handle);
|
||
|
BZERO(&thread_table[i].context, sizeof(CONTEXT));
|
||
|
UNLOCK();
|
||
|
}
|
||
|
break;
|
||
|
}
|
||
|
return TRUE;
|
||
|
}
|
||
|
|
||
|
#endif /* WIN32_THREADS */
|