libc/inc/mtlib.h

	mtlib.h revision 7257d1b4d25bfac0c802847390e98a464fd787ac
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _MTLIB_H
#define _MTLIB_H

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <thread.h>

#ifdef  __cplusplus
extern "C" {
#endif

/* these are private to the library */
extern  int primary_link_map;
extern  void    lmutex_lock(mutex_t *);
extern  void    lmutex_unlock(mutex_t *);
extern  void    lrw_rdlock(rwlock_t *);
extern  void    lrw_wrlock(rwlock_t *);
extern  void    lrw_unlock(rwlock_t *);
extern  void    sig_mutex_lock(mutex_t *);
extern  void    sig_mutex_unlock(mutex_t *);
extern  int sig_mutex_trylock(mutex_t *);
extern  int sig_cond_wait(cond_t *, mutex_t *);
extern  int sig_cond_reltimedwait(cond_t *, mutex_t *, const timespec_t *);
extern  void    cancel_safe_mutex_lock(mutex_t *);
extern  void    cancel_safe_mutex_unlock(mutex_t *);
extern  int cancel_safe_mutex_trylock(mutex_t *);
extern  int cancel_active(void);
extern  int _thrp_cancelled(void);

/* the private libc thread-safe allocator */
extern  void    *lmalloc(size_t);
extern  void    lfree(void *, size_t);

#if defined(THREAD_DEBUG)
extern  void    assert_no_libc_locks_held(void);
#else
#define assert_no_libc_locks_held()
#endif

#define _FWRITE _fwrite_unlocked
#define FILENO(s) _fileno(s)
#define FERROR(s) ferror(s)
#define GETC(s) _getc_unlocked(s)
#define UNGETC(c, s) _ungetc_unlocked(c, s)
#define PUTC(c, s) _putc_unlocked(c, s)
#define GETWC(s) getwc(s)
#define PUTWC(c, s) putwc(c, s)

/*
 * Cheap check to tell if stdio needs to lock for MT progs.
 * Referenced directly in port/stdio/flush.c and FLOCKFILE and
 * FUNLOCKFILE macros.  __libc_threaded gets set to 1 when the first
 * thread (beyond the main thread) is created in _thrp_create().
 */
extern  int __libc_threaded;

#define FILELOCKING(iop)    (GET_IONOLOCK(iop) == 0)

#define FLOCKFILE(lk, iop) \
    { \
        if (__libc_threaded && FILELOCKING(iop)) \
            lk = _flockget((iop)); \
        else \
            lk = NULL; \
    }

#define FUNLOCKFILE(lk) \
    { \
        if (lk != NULL) \
            _flockrel(lk); \
    }

#define FLOCKRETURN(iop, ret) \
    {   int r; \
        rmutex_t *lk; \
        FLOCKFILE(lk, iop); \
        r = (ret); \
        FUNLOCKFILE(lk); \
        return (r); \
    }

#ifdef  __cplusplus
}
#endif

#endif  /* _MTLIB_H */