Initial revision
This commit is contained in:
Akinori Ito
209
gc/win32_threads.c
Executable file
209
gc/win32_threads.c
Executable file
@@ -0,0 +1,209 @@
|
||||
#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 */
|
||||
Reference in New Issue
Block a user