sl@0: #include "stlport_prefix.h"
sl@0: 
sl@0: #if defined(__unix) && defined(__GNUC__)
sl@0: 
sl@0: #ifdef __FreeBSD__
sl@0: #  include <osreldate.h>
sl@0: #endif
sl@0: 
sl@0: #if (defined(__FreeBSD__) && (__FreeBSD_version < 503001)) || defined(__sun)
sl@0: /* Note: __cxa_finalize and __cxa_atexit present in libc in FreeBSD 5.3, but again absent in 6.0 */
sl@0: 
sl@0: #include <stdlib.h>
sl@0: #include <stdio.h>
sl@0: #include <pthread.h>
sl@0: 
sl@0: /* __asm__ (".symver " "__cxa_finalize" "," "__cxa_finalize" "@" "STLPORT_5_0_0"); */
sl@0: /* __asm__ (".symver " "__cxa_finalize" "," "__cxa_finalize" "@@" "STLPORT_5_0_0"); */
sl@0: 
sl@0: /* Not atomic! */
sl@0: /* But we can use static mutexes here: I hope that performance issue isn't very
sl@0:    significant on unloading (for only few calls, ~10) - ptr */
sl@0: 
sl@0: /*
sl@0: #define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
sl@0:   ({ __typeof (mem) __gmemp = (mem);                                  \
sl@0:      __typeof (*mem) __gnewval = (newval);                            \
sl@0:                                                                       \
sl@0:      *__gmemp == (oldval) ? (*__gmemp = __gnewval, 0) : 1; })
sl@0: */
sl@0: 
sl@0: enum {
sl@0:   ef_free, /* `ef_free' MUST be zero!  */
sl@0:   ef_us,
sl@0:   ef_on,
sl@0:   ef_at,
sl@0:   ef_cxa
sl@0: };
sl@0: 
sl@0: struct exit_function
sl@0: {
sl@0:   /* `flavour' should be of type of the `enum' above but since we need
sl@0:      this element in an atomic operation we have to use `long int'.  */
sl@0:   long int flavor;
sl@0:   union {
sl@0:     void (*at)(void);
sl@0:     struct {
sl@0:       void (*fn)(int status, void *arg);
sl@0:       void *arg;
sl@0:     } on;
sl@0:     struct {
sl@0:       void (*fn)(void *arg, int status);
sl@0:       void *arg;
sl@0:       void *dso_handle;
sl@0:     } cxa;
sl@0:   } func;
sl@0: };
sl@0: 
sl@0: struct exit_function_list
sl@0: {
sl@0:   struct exit_function_list *next;
sl@0:   size_t idx;
sl@0:   struct exit_function fns[32];
sl@0: };
sl@0: 
sl@0: struct exit_function *__new_exitfn (void);
sl@0: 
sl@0: /* Register a function to be called by exit or when a shared library
sl@0:    is unloaded.  This function is only called from code generated by
sl@0:    the C++ compiler.  */
sl@0: int __cxa_atexit(void (*func)(void *), void *arg, void *d)
sl@0: {
sl@0:   struct exit_function *new = __new_exitfn ();
sl@0: 
sl@0:   if ( new == NULL )
sl@0:     return -1;
sl@0: 
sl@0:   new->flavor = ef_cxa;
sl@0:   new->func.cxa.fn = (void (*) (void *, int)) func;
sl@0:   new->func.cxa.arg = arg;
sl@0:   new->func.cxa.dso_handle = d;
sl@0:   return 0;
sl@0: }
sl@0: 
sl@0: 
sl@0: /* We change global data, so we need locking.  */
sl@0: #ifdef __linux__
sl@0: static pthread_mutex_t lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
sl@0: #endif
sl@0: #ifdef __FreeBSD__
sl@0: static pthread_mutex_t lock =
sl@0:   { PTHREAD_MUTEX_RECURSIVE /* PTHREAD_MUTEX_DEFAULT */, PTHREAD_PRIO_NONE, {NULL,NULL},
sl@0:     NULL, { NULL }, /* MUTEX_FLAGS_PRIVATE */ 0x1, 0, 0, 0, {NULL, NULL},
sl@0:     { 0, 0, 0, 0 } };
sl@0: #endif
sl@0: #ifdef __sun
sl@0: static pthread_mutex_t lock =
sl@0:   {{0, 0, 0, PTHREAD_MUTEX_RECURSIVE, _MUTEX_MAGIC}, {{{0}}}, 0};
sl@0: #endif
sl@0: 
sl@0: 
sl@0: static struct exit_function_list initial;
sl@0: struct exit_function_list *__exit_funcs = &initial;
sl@0: 
sl@0: struct exit_function *__new_exitfn(void)
sl@0: {
sl@0:   struct exit_function_list *l;
sl@0:   size_t i = 0;
sl@0: 
sl@0:   pthread_mutex_lock( &lock );
sl@0: 
sl@0:   for (l = __exit_funcs; l != NULL; l = l->next) {
sl@0:     for (i = 0; i < l->idx; ++i)
sl@0:       if (l->fns[i].flavor == ef_free)
sl@0:         break;
sl@0:     if ( i < l->idx )
sl@0:       break;
sl@0: 
sl@0:     if (l->idx < sizeof (l->fns) / sizeof (l->fns[0])) {
sl@0:       i = l->idx++;
sl@0:       break;
sl@0:     }
sl@0:   }
sl@0: 
sl@0:   if (l == NULL) {
sl@0:     l = (struct exit_function_list *)malloc( sizeof(struct exit_function_list) );
sl@0:     if (l != NULL) {
sl@0:       l->next = __exit_funcs;
sl@0:       __exit_funcs = l;
sl@0: 
sl@0:       l->idx = 1;
sl@0:       i = 0;
sl@0:     }
sl@0:   }
sl@0: 
sl@0:   /* Mark entry as used, but we don't know the flavor now.  */
sl@0:   if ( l != NULL )
sl@0:     l->fns[i].flavor = ef_us;
sl@0: 
sl@0:   pthread_mutex_unlock( &lock );
sl@0: 
sl@0:   return l == NULL ? NULL : &l->fns[i];
sl@0: }
sl@0: 
sl@0: /* If D is non-NULL, call all functions registered with `__cxa_atexit'
sl@0:    with the same dso handle.  Otherwise, if D is NULL, call all of the
sl@0:    registered handlers.  */
sl@0: 
sl@0: /*
sl@0:  * Note, that original __cxa_finalize don't use lock, but use __exit_funcs
sl@0:  * i.e. global data.
sl@0:  */
sl@0: void __cxa_finalize(void *d)
sl@0: {
sl@0:   struct exit_function_list *funcs;
sl@0: 
sl@0:   pthread_mutex_lock( &lock );
sl@0:   for (funcs = __exit_funcs; funcs; funcs = funcs->next) {
sl@0:     struct exit_function *f;
sl@0: 
sl@0:     for (f = &funcs->fns[funcs->idx - 1]; f >= &funcs->fns[0]; --f) {
sl@0:       if ( (d == NULL || d == f->func.cxa.dso_handle) && (f->flavor == ef_cxa) ) {
sl@0:         f->flavor = ef_free;
sl@0:         (*f->func.cxa.fn) (f->func.cxa.arg, 0);
sl@0:       }
sl@0:     }
sl@0:   }
sl@0: 
sl@0:   /* Remove the registered fork handlers.  We do not have to
sl@0:      unregister anything if the program is going to terminate anyway.  */
sl@0: #ifdef UNREGISTER_ATFORK
sl@0:   if (d != NULL)
sl@0:     UNREGISTER_ATFORK (d);
sl@0: #endif
sl@0:   pthread_mutex_unlock( &lock );
sl@0: }
sl@0: 
sl@0: /* __asm__ (".symver " "__cxa_finalize" "," "__cxa_finalize" "@@" "STLPORT_5_0_0"); */
sl@0: /* void __cxa_finalize(void *d) __attribute__ ((weak)); */
sl@0: 
sl@0: #endif /* OS name */
sl@0: #endif /* __unix */
sl@0: