358702366c
it around an application's fork() call. Our new thread libraries (libthr, libpthread) can now have threads running while another thread calls fork(). In this case, it is possible for malloc to be left in an inconsistent state in the child. Our thread libraries, libpthread in particular, need to use malloc internally after a fork (in the child). Reviewed by: davidxu
132 lines
3.9 KiB
C
132 lines
3.9 KiB
C
/*
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* Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Birrell.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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* Private definitions for libc, libc_r and libpthread.
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*
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*/
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#ifndef _LIBC_PRIVATE_H_
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#define _LIBC_PRIVATE_H_
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#include <spinlock.h>
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/*
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* This global flag is non-zero when a process has created one
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* or more threads. It is used to avoid calling locking functions
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* when they are not required.
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*/
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extern int __isthreaded;
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/*
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* File lock contention is difficult to diagnose without knowing
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* where locks were set. Allow a debug library to be built which
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* records the source file and line number of each lock call.
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*/
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#ifdef _FLOCK_DEBUG
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#define _FLOCKFILE(x) _flockfile_debug(x, __FILE__, __LINE__)
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#else
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#define _FLOCKFILE(x) _flockfile(x)
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#endif
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/*
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* Macros for locking and unlocking FILEs. These test if the
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* process is threaded to avoid locking when not required.
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*/
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#define FLOCKFILE(fp) if (__isthreaded) _FLOCKFILE(fp)
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#define FUNLOCKFILE(fp) if (__isthreaded) _funlockfile(fp)
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/*
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* Indexes into the pthread jump table.
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*
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* Warning! If you change this type, you must also change the threads
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* libraries that reference it (libc_r, libpthread).
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*/
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typedef enum {
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PJT_COND_BROADCAST,
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PJT_COND_DESTROY,
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PJT_COND_INIT,
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PJT_COND_SIGNAL,
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PJT_COND_WAIT,
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PJT_GETSPECIFIC,
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PJT_KEY_CREATE,
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PJT_KEY_DELETE,
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PJT_MAIN_NP,
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PJT_MUTEX_DESTROY,
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PJT_MUTEX_INIT,
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PJT_MUTEX_LOCK,
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PJT_MUTEX_TRYLOCK,
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PJT_MUTEX_UNLOCK,
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PJT_MUTEXATTR_DESTROY,
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PJT_MUTEXATTR_INIT,
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PJT_MUTEXATTR_SETTYPE,
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PJT_ONCE,
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PJT_RWLOCK_DESTROY,
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PJT_RWLOCK_INIT,
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PJT_RWLOCK_RDLOCK,
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PJT_RWLOCK_TRYRDLOCK,
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PJT_RWLOCK_TRYWRLOCK,
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PJT_RWLOCK_UNLOCK,
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PJT_RWLOCK_WRLOCK,
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PJT_SELF,
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PJT_SETSPECIFIC,
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PJT_SIGMASK,
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PJT_MAX
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} pjt_index_t;
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typedef int (*pthread_func_t)(void);
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typedef pthread_func_t pthread_func_entry_t[2];
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extern pthread_func_entry_t __thr_jtable[];
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/*
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* yplib internal interfaces
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*/
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#ifdef YP
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int _yp_check(char **);
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#endif
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/*
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* This is a pointer in the C run-time startup code. It is used
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* by getprogname() and setprogname().
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*/
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extern const char *__progname;
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/*
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* This is the lock to make malloc() thread-safe. It is externalized
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* so that thread libraries can protect malloc across fork().
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*/
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extern spinlock_t *__malloc_lock;
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#endif /* _LIBC_PRIVATE_H_ */
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