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Move pthread-locking stuff to "internal.h".
(_U_dyn_info_list_lock): Rename from "registration_lock" and change from r/w-lock to a simple mutex (spin) lock. (_U_dyn_register): Insert into doubly-linked list. (Logical change 1.30)
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1 changed files with 9 additions and 42 deletions
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#include <libunwind.h>
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#include "internal.h"
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#ifndef HAVE_CMP8XCHG16
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pthread_mutex_t _U_dyn_info_list_lock = PTHREAD_MUTEX_INITIALIZER;
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#include <pthread.h>
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/* Make it easy to write thread-safe code which may or may not be
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linked against libpthread. The macros below can be used
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unconditionally and if -lpthread is around, they'll call the
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corresponding routines otherwise, they do nothing. */
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#pragma weak pthread_rwlock_rdlock
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#pragma weak pthread_rwlock_wrlock
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#pragma weak pthread_rwlock_unlock
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#define rw_rdlock(l) (pthread_rwlock_rdlock ? pthread_rwlock_rdlock (l) : 0)
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#define rw_wrlock(l) (pthread_rwlock_wrlock ? pthread_rwlock_wrlock (l) : 0)
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#define rw_unlock(l) (pthread_rwlock_unlock ? pthread_rwlock_unlock (l) : 0)
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static pthread_rwlock_t registration_lock = PTHREAD_RWLOCK_INITIALIZER;
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#endif
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extern unw_dyn_info_list_t _U_dyn_info_list;
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int
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void
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_U_dyn_register (unw_dyn_info_t *di)
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{
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#ifdef HAVE_CMP8XCHG16
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unw_dyn_info_t *old_list_head, *new_list_head;
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unsigned long old_gen, new_gen;
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do
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{
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old_gen = _U_dyn_info_list.generation;
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old_list_head = _U_dyn_info_list.first;
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new_gen = old_gen + 1;
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new_list_head = di;
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di->next = old_list_head;
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}
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while (cmp8xchg16 (&_U_dyn_info_list, new_gen, new_list_head) != old_gen);
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#else
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rw_wrlock (®istration_lock);
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mutex_lock (&_U_dyn_info_list_lock);
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{
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++_U_dyn_info_list.generation;
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di->next = _U_dyn_info_list.first;
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di->prev = NULL;
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if (di->next)
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di->next->prev = di;
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_U_dyn_info_list.first = di;
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}
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rw_unlock (®istration_lock);
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#endif
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mutex_unlock (&_U_dyn_info_list_lock);
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}
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