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Diffstat (limited to 'winsup/mingw/mthr.c')
| -rw-r--r-- | winsup/mingw/mthr.c | 206 |
1 files changed, 0 insertions, 206 deletions
diff --git a/winsup/mingw/mthr.c b/winsup/mingw/mthr.c deleted file mode 100644 index 24855479a..000000000 --- a/winsup/mingw/mthr.c +++ /dev/null @@ -1,206 +0,0 @@ -/* - * mthr.c - * - * Implement Mingw thread-support DLL . - * - * This file is used iff the following conditions are met: - * - gcc uses -mthreads option - * - user code uses C++ exceptions - * - * The sole job of the Mingw thread support DLL (MingwThr) is to catch - * all the dying threads and clean up the data allocated in the TLSs - * for exception contexts during C++ EH. Posix threads have key dtors, - * but win32 TLS keys do not, hence the magic. Without this, there's at - * least `6 * sizeof (void*)' bytes leaks for each catch/throw in each - * thread. The only public interface is __mingwthr_key_dtor(). - * - * Created by Mumit Khan <khan@nanotech.wisc.edu> - * - */ - -#define WIN32_LEAN_AND_MEAN -#include <windows.h> -#undef WIN32_LEAN_AND_MEAN -#include <stdlib.h> - -/* To protect the thread/key association data structure modifications. */ -CRITICAL_SECTION __mingwthr_cs; - -typedef struct __mingwthr_thread __mingwthr_thread_t; -typedef struct __mingwthr_key __mingwthr_key_t; - -/* The list of threads active with key/dtor pairs. */ -struct __mingwthr_key { - DWORD key; - void (*dtor) (void *); - __mingwthr_key_t *next; -}; - -/* The list of key/dtor pairs for a particular thread. */ -struct __mingwthr_thread { - DWORD thread_id; - __mingwthr_key_t *keys; - __mingwthr_thread_t *next; -}; - -static __mingwthr_thread_t *__mingwthr_thread_list; - -/* - * __mingwthr_key_add: - * - * Add key/dtor association for this thread. If the thread entry does not - * exist, create a new one and add to the head of the threads list; add - * the new assoc at the head of the keys list. - * - */ - -static int -__mingwthr_add_key_dtor (DWORD thread_id, DWORD key, void (*dtor) (void *)) -{ - __mingwthr_thread_t *threadp; - __mingwthr_key_t *new_key; - - new_key = (__mingwthr_key_t *) calloc (1, sizeof (__mingwthr_key_t)); - if (new_key == NULL) - return -1; - - new_key->key = key; - new_key->dtor = dtor; - - /* This may be called by multiple threads, and so we need to protect - the whole process of adding the key/dtor pair. */ - EnterCriticalSection (&__mingwthr_cs); - - for (threadp = __mingwthr_thread_list; - threadp && (threadp->thread_id != thread_id); - threadp = threadp->next) - ; - - if (threadp == NULL) - { - threadp = (__mingwthr_thread_t *) - calloc (1, sizeof (__mingwthr_thread_t)); - if (threadp == NULL) - { - free (new_key); - LeaveCriticalSection (&__mingwthr_cs); - return -1; - } - threadp->thread_id = thread_id; - threadp->next = __mingwthr_thread_list; - __mingwthr_thread_list = threadp; - } - - new_key->next = threadp->keys; - threadp->keys = new_key; - - LeaveCriticalSection (&__mingwthr_cs); - -#ifdef DEBUG - printf ("%s: allocating: (%ld, %ld, %x)\n", - __FUNCTION__, thread_id, key, dtor); -#endif - - return 0; -} - -/* - * __mingwthr_run_key_dtors (DWORD thread_id): - * - * Callback from DllMain when thread detaches to clean up the key - * storage. - * - * Note that this does not delete the key itself, but just runs - * the dtor if the current value are both non-NULL. Note that the - * keys with NULL dtors are not added by __mingwthr_key_dtor, the - * only public interface, so we don't need to check. - * - */ - -void -__mingwthr_run_key_dtors (DWORD thread_id) -{ - __mingwthr_thread_t *prev_threadp, *threadp; - __mingwthr_key_t *keyp; - -#ifdef DEBUG - printf ("%s: Entering Thread id %ld\n", __FUNCTION__, thread_id); -#endif - - /* Since this is called just once per thread, we only need to protect - the part where we take out this thread's entry and reconfigure the - list instead of wrapping the whole process in a critical section. */ - EnterCriticalSection (&__mingwthr_cs); - - prev_threadp = NULL; - for (threadp = __mingwthr_thread_list; - threadp && (threadp->thread_id != thread_id); - prev_threadp = threadp, threadp = threadp->next) - ; - - if (threadp == NULL) - { - LeaveCriticalSection (&__mingwthr_cs); - return; - } - - /* take the damned thread out of the chain. */ - if (prev_threadp == NULL) /* first entry hit. */ - __mingwthr_thread_list = threadp->next; - else - prev_threadp->next = threadp->next; - - LeaveCriticalSection (&__mingwthr_cs); - - for (keyp = threadp->keys; keyp; ) - { - __mingwthr_key_t *prev_keyp; - LPVOID value = TlsGetValue (keyp->key); - if (GetLastError () == ERROR_SUCCESS) - { -#ifdef DEBUG - printf (" (%ld, %x)\n", keyp->key, keyp->dtor); -#endif - if (value) - (*keyp->dtor) (value); - } -#ifdef DEBUG - else - { - printf (" TlsGetValue FAILED (%ld, %x)\n", - keyp->key, keyp->dtor); - } -#endif - prev_keyp = keyp; - keyp = keyp->next; - free (prev_keyp); - } - - free (threadp); - -#ifdef DEBUG - printf ("%s: Exiting Thread id %ld\n", __FUNCTION__, thread_id); -#endif -} - -/* - * __mingwthr_register_key_dtor (DWORD key, void (*dtor) (void *)) - * - * Public interface called by C++ exception handling mechanism in - * libgcc (cf: __gthread_key_create). - * - */ - -__declspec(dllexport) -int -__mingwthr_key_dtor (DWORD key, void (*dtor) (void *)) -{ - if (dtor) - { - DWORD thread_id = GetCurrentThreadId (); - return __mingwthr_add_key_dtor (thread_id, key, dtor); - } - - return 0; -} - |