/* Copyright (C) 1994, 1996 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #ifndef _LOCK_INTERN_H #define _LOCK_INTERN_H #include <machine-lock.h> #ifndef _EXTERN_INLINE #define _EXTERN_INLINE extern __inline #endif /* Initialize LOCK. */ _EXTERN_INLINE void __spin_lock_init (__spin_lock_t *__lock) { *__lock = __SPIN_LOCK_INITIALIZER; } /* Lock LOCK, blocking if we can't get it. */ extern void __spin_lock_solid (__spin_lock_t *__lock); /* Lock the spin lock LOCK. */ _EXTERN_INLINE void __spin_lock (__spin_lock_t *__lock) { if (! __spin_try_lock (__lock)) __spin_lock_solid (__lock); } /* Name space-clean internal interface to mutex locks. Code internal to the C library uses these functions to lock and unlock mutex locks. These locks are of type `struct mutex', defined in <cthreads.h>. The functions here are name space-clean. If the program is linked with the cthreads library, `__mutex_lock_solid' and `__mutex_unlock_solid' will invoke the corresponding cthreads functions to implement real mutex locks. If not, simple stub versions just use spin locks. */ /* Initialize the newly allocated mutex lock LOCK for further use. */ extern void __mutex_init (void *__lock); /* Lock LOCK, blocking if we can't get it. */ extern void __mutex_lock_solid (void *__lock); /* Finish unlocking LOCK, after the spin lock LOCK->held has already been unlocked. This function will wake up any thread waiting on LOCK. */ extern void __mutex_unlock_solid (void *__lock); /* Lock the mutex lock LOCK. */ _EXTERN_INLINE void __mutex_lock (void *__lock) { if (! __spin_try_lock ((__spin_lock_t *) __lock)) __mutex_lock_solid (__lock); } /* Unlock the mutex lock LOCK. */ _EXTERN_INLINE void __mutex_unlock (void *__lock) { __spin_unlock ((__spin_lock_t *) __lock); __mutex_unlock_solid (__lock); } _EXTERN_INLINE int __mutex_trylock (void *__lock) { return __spin_try_lock ((__spin_lock_t *) __lock); } #endif /* lock-intern.h */