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gcc/boehm-gc/win32_threads.c

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#if defined(GC_WIN32_THREADS)
#include "private/gc_priv.h"
#include <windows.h>
#ifdef CYGWIN32
# include <errno.h>
/* Cygwin-specific forward decls */
# undef pthread_create
# undef pthread_sigmask
# undef pthread_join
# undef dlopen
# define DEBUG_CYGWIN_THREADS 0
GC_bool GC_thr_initialized = FALSE;
void * GC_start_routine(void * arg);
void GC_thread_exit_proc(void *arg);
#endif
#ifndef MAX_THREADS
# define MAX_THREADS 64
#endif
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;
# ifdef CYGWIN32
void *status; /* hold exit value until join in case it's a pointer */
pthread_t pthread_id;
# endif
};
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. */
# ifdef CYGWIN32
{ int i; /* pthreads may keep a pointer in the thread exit value */
for (i = 0; i < MAX_THREADS; i++)
if (thread_table[i].in_use) GC_push_all((ptr_t)&(thread_table[i].status),(ptr_t)(&(thread_table[i].status)+1));
}
# endif
}
void GC_stop_world()
{
DWORD thread_id = GetCurrentThreadId();
int i;
#ifdef CYGWIN32
if (!GC_thr_initialized) ABORT("GC_stop_world() called before GC_thr_init()");
#endif
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; /* prevent stack from being pushed */
# ifndef CYGWIN32
/* this breaks pthread_join on Cygwin, which is guaranteed to */
/* only see user pthreads */
thread_table[i].in_use = FALSE;
CloseHandle(thread_table[i].handle);
BZERO((void *)(&thread_table[i].context), sizeof(CONTEXT));
# endif
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
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);
if (thread_table[i].context.Esp >= (DWORD)thread_table[i].stack
|| thread_table[i].context.Esp < (DWORD)bottom) {
WARN("Thread stack pointer 0x%lx out of range, pushing everything",
thread_table[i].context.Esp);
GC_push_all_stack((char *) bottom, thread_table[i].stack);
} else {
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(CYGWIN32)
#if !defined(MSWINCE) && defined(GC_DLL)
/* We register threads from DllMain */
GC_API 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(GC_DLL)) */
/* We have no DllMain to take care of new threads. Thus we */
/* must properly intercept thread creation. */
typedef struct {
HANDLE child_ready_h, parent_ready_h;
volatile struct thread_entry * entry;
LPTHREAD_START_ROUTINE start;
LPVOID param;
} thread_args;
static DWORD WINAPI thread_start(LPVOID arg);
GC_API 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;
if (!DuplicateHandle(GetCurrentProcess(),
thread_h,
GetCurrentProcess(),
(PHANDLE) &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");
}
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. */
#ifndef __GNUC__
__try {
#endif /* __GNUC__ */
ret = args.start (args.param);
#ifndef __GNUC__
} __finally {
#endif /* __GNUC__ */
LOCK();
args.entry->stack = 0;
args.entry->in_use = FALSE;
/* cast away volatile qualifier */
BZERO((void *) &args.entry->context, sizeof(CONTEXT));
UNLOCK();
#ifndef __GNUC__
}
#endif /* __GNUC__ */
return ret;
}
#endif /* !defined(MSWINCE) && !(defined(__MINGW32__) && !defined(_DLL)) */
#endif /* !CYGWIN32 */
#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);
/* threadAttach/threadDetach routines used by both CYGWIN and DLL
* implementation, since both recieve explicit notification on thread
* creation/destruction.
*/
static void threadAttach() {
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 */
# if defined(MPROTECT_VDB)
if (GC_incremental) SetUnhandledExceptionFilter(GC_write_fault_handler);
# endif
/* cast away volatile qualifier */
for (i = 0; InterlockedExchange((LONG*)&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();
# ifdef CYGWIN32
thread_table[i].pthread_id = pthread_self();
# endif
if (!DuplicateHandle(GetCurrentProcess(),
GetCurrentThread(),
GetCurrentProcess(),
(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 (thread_table[i].stack == NULL)
ABORT("Failed to find stack base in threadAttach");
/* 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);
}
static void threadDetach(DWORD thread_id) {
int i;
LOCK();
for (i = 0;
i < MAX_THREADS &&
(!thread_table[i].in_use || 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();
}
#ifdef CYGWIN32
/* Called by GC_init() - we hold the allocation lock. */
void GC_thr_init() {
if (GC_thr_initialized) return;
GC_thr_initialized = TRUE;
#if 0
/* this might already be handled in GC_init... */
InitializeCriticalSection(&GC_allocate_ml);
#endif
/* Add the initial thread, so we can stop it. */
threadAttach();
}
struct start_info {
void *(*start_routine)(void *);
void *arg;
};
int GC_pthread_join(pthread_t pthread_id, void **retval) {
int result;
int i;
# if DEBUG_CYGWIN_THREADS
GC_printf3("thread 0x%x(0x%x) is joining thread 0x%x.\n",(int)pthread_self(),
GetCurrentThreadId(), (int)pthread_id);
# endif
/* Can't do any table lookups here, because thread being joined
might not have registered itself yet */
result = pthread_join(pthread_id, retval);
LOCK();
for (i = 0; !thread_table[i].in_use || thread_table[i].pthread_id != pthread_id;
i++) {
if (i == MAX_THREADS - 1) {
GC_printf1("Failed to find thread 0x%x in pthread_join()\n", pthread_id);
ABORT("thread not found on detach");
}
}
UNLOCK();
threadDetach(thread_table[i].id);
# if DEBUG_CYGWIN_THREADS
GC_printf3("thread 0x%x(0x%x) completed join with thread 0x%x.\n",
(int)pthread_self(), GetCurrentThreadId(), (int)pthread_id);
# endif
return result;
}
/* Cygwin-pthreads calls CreateThread internally, but it's not
* easily interceptible by us..
* so intercept pthread_create instead
*/
int
GC_pthread_create(pthread_t *new_thread,
const pthread_attr_t *attr,
void *(*start_routine)(void *), void *arg) {
int result;
struct start_info * si;
if (!GC_is_initialized) GC_init();
/* make sure GC is initialized (i.e. main thread is attached) */
/* This is otherwise saved only in an area mmapped by the thread */
/* library, which isn't visible to the collector. */
si = GC_malloc_uncollectable(sizeof(struct start_info));
if (0 == si) return(EAGAIN);
si -> start_routine = start_routine;
si -> arg = arg;
# if DEBUG_CYGWIN_THREADS
GC_printf2("About to create a thread from 0x%x(0x%x)\n",(int)pthread_self(),
GetCurrentThreadId);
# endif
result = pthread_create(new_thread, attr, GC_start_routine, si);
if (result) { /* failure */
GC_free(si);
}
return(result);
}
void * GC_start_routine(void * arg)
{
struct start_info * si = arg;
void * result;
void *(*start)(void *);
void *start_arg;
pthread_t pthread_id;
int i;
# if DEBUG_CYGWIN_THREADS
GC_printf2("thread 0x%x(0x%x) starting...\n",(int)pthread_self(),
GetCurrentThreadId());
# endif
/* If a GC occurs before the thread is registered, that GC will */
/* ignore this thread. That's fine, since it will block trying to */
/* acquire the allocation lock, and won't yet hold interesting */
/* pointers. */
LOCK();
/* We register the thread here instead of in the parent, so that */
/* we don't need to hold the allocation lock during pthread_create. */
threadAttach();
UNLOCK();
start = si -> start_routine;
start_arg = si -> arg;
pthread_id = pthread_self();
GC_free(si); /* was allocated uncollectable */
pthread_cleanup_push(GC_thread_exit_proc, pthread_id);
result = (*start)(start_arg);
pthread_cleanup_pop(0);
# if DEBUG_CYGWIN_THREADS
GC_printf2("thread 0x%x(0x%x) returned from start routine.\n",
(int)pthread_self(),GetCurrentThreadId());
# endif
LOCK();
for (i = 0; thread_table[i].pthread_id != pthread_id; i++) {
if (i == MAX_THREADS - 1)
ABORT("thread not found on exit");
}
thread_table[i].status = result;
UNLOCK();
return(result);
}
void GC_thread_exit_proc(void *arg)
{
pthread_t pthread_id = (pthread_t)arg;
int i;
# if DEBUG_CYGWIN_THREADS
GC_printf2("thread 0x%x(0x%x) called pthread_exit().\n",
(int)pthread_self(),GetCurrentThreadId());
# endif
LOCK();
for (i = 0; thread_table[i].pthread_id != pthread_id; i++) {
if (i == MAX_THREADS - 1)
ABORT("thread not found on exit");
}
UNLOCK();
#if 0
/* TODO: we need a way to get the exit value after a pthread_exit so we can stash it safely away */
thread_table[i].status = ???
#endif
}
/* nothing required here... */
int GC_pthread_sigmask(int how, const sigset_t *set, sigset_t *oset) {
return pthread_sigmask(how, set, oset);
}
int GC_pthread_detach(pthread_t thread) {
return pthread_detach(thread);
}
#else /* !CYGWIN32 */
/*
* We avoid acquiring locks here, since this doesn't seem to be preemptable.
* Pontus Rydin suggests wrapping the thread start routine instead.
*/
#ifdef GC_DLL
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:
threadAttach();
break;
case DLL_THREAD_DETACH:
threadDetach(GetCurrentThreadId());
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 /* GC_DLL */
#endif /* !CYGWIN32 */
# endif /* !MSWINCE */
#endif /* GC_WIN32_THREADS */
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