diff options
| author | cvs2svn <cvs2svn@FreeBSD.org> | 1998-07-24 04:57:32 +0000 |
|---|---|---|
| committer | cvs2svn <cvs2svn@FreeBSD.org> | 1998-07-24 04:57:32 +0000 |
| commit | 95b66175a329d81a892710c81f126f1071ac17a0 (patch) | |
| tree | 421828aefe3abbbd256758667fa2e8fcd1dc8eaa /lib | |
| parent | 21a9168142cf87c9b9fa0cef9a0f5657e9eade71 (diff) | |
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/libc/gen/_spinlock_stub.c | 64 | ||||
| -rw-r--r-- | lib/libc/include/libc_private.h | 66 | ||||
| -rw-r--r-- | lib/libc/include/spinlock.h | 71 | ||||
| -rw-r--r-- | lib/libc/stdio/_flock_stub.c | 81 | ||||
| -rw-r--r-- | lib/libc_r/uthread/uthread_recvmsg.c | 72 | ||||
| -rw-r--r-- | lib/libc_r/uthread/uthread_sendmsg.c | 71 | ||||
| -rw-r--r-- | lib/libc_r/uthread/uthread_spinlock.c | 108 |
7 files changed, 0 insertions, 533 deletions
diff --git a/lib/libc/gen/_spinlock_stub.c b/lib/libc/gen/_spinlock_stub.c deleted file mode 100644 index a189eef7f2e1..000000000000 --- a/lib/libc/gen/_spinlock_stub.c +++ /dev/null @@ -1,64 +0,0 @@ -/* - * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by John Birrell. - * 4. Neither the name of the author nor the names of any co-contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * $Id: _spinlock_stub.c,v 1.2 1998/04/29 09:02:16 jb Exp $ - * - */ - -#include <stdio.h> - -/* Don't build these stubs into libc_r: */ -#ifndef _THREAD_SAFE -#include "spinlock.h" - -/* - * Declare weak references in case the application is not linked - * with libpthread. - */ -#pragma weak _spinlock=_spinlock_stub -#pragma weak _spinlock_debug=_spinlock_debug_stub - -/* - * This function is a stub for the spinlock function in libpthread. - */ -void -_spinlock_stub(spinlock_t *lck) -{ -} - -/* - * This function is a stub for the debug spinlock function in libpthread. - */ -void -_spinlock_debug_stub(spinlock_t *lck, char *fname, int lineno) -{ -} -#endif diff --git a/lib/libc/include/libc_private.h b/lib/libc/include/libc_private.h deleted file mode 100644 index b8248824a9b6..000000000000 --- a/lib/libc/include/libc_private.h +++ /dev/null @@ -1,66 +0,0 @@ -/* - * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by John Birrell. - * 4. Neither the name of the author nor the names of any co-contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * $Id: libc_private.h,v 1.1 1998/04/11 06:57:33 jb Exp $ - * - * Private definitions for libc, libc_r and libpthread. - * - */ - -#ifndef _LIBC_PRIVATE_H_ -#define _LIBC_PRIVATE_H_ - -/* - * This global flag is non-zero when a process has created one - * or more threads. It is used to avoid calling locking functions - * when they are not required. - */ -extern int __isthreaded; - -/* - * File lock contention is difficult to diagnose without knowing - * where locks were set. Allow a debug library to be built which - * records the source file and line number of each lock call. - */ -#ifdef _FLOCK_DEBUG -#define _FLOCKFILE(x) _flockfile_debug(x, __FILE__, __LINE__) -#else -#define _FLOCKFILE(x) flockfile(x) -#endif - -/* - * Macros for locking and unlocking FILEs. These test if the - * process is threaded to avoid locking when not required. - */ -#define FLOCKFILE(fp) if (__isthreaded) _FLOCKFILE(fp) -#define FUNLOCKFILE(fp) if (__isthreaded) funlockfile(fp) - -#endif /* _LIBC_PRIVATE_H_ */ diff --git a/lib/libc/include/spinlock.h b/lib/libc/include/spinlock.h deleted file mode 100644 index e3136846afab..000000000000 --- a/lib/libc/include/spinlock.h +++ /dev/null @@ -1,71 +0,0 @@ -/* - * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by John Birrell. - * 4. Neither the name of the author nor the names of any co-contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * $Id: spinlock.h,v 1.2 1998/05/05 21:46:30 jb Exp $ - * - * Lock definitions used in both libc and libpthread. - * - */ - -#ifndef _SPINLOCK_H_ -#define _SPINLOCK_H_ -#include <sys/cdefs.h> -#include <sys/types.h> - -/* - * Lock structure with room for debugging information. - */ -typedef struct { - volatile long access_lock; - volatile long lock_owner; - volatile char *fname; - volatile int lineno; -} spinlock_t; - -#define _SPINLOCK_INITIALIZER { 0, 0, 0, 0 } - -#define _SPINUNLOCK(_lck) (_lck)->access_lock = 0 -#ifdef _LOCK_DEBUG -#define _SPINLOCK(_lck) _spinlock_debug(_lck, __FILE__, __LINE__) -#else -#define _SPINLOCK(_lck) _spinlock(_lck) -#endif - -/* - * Thread function prototype definitions: - */ -__BEGIN_DECLS -long _atomic_lock __P((volatile long *)); -void _spinlock __P((spinlock_t *)); -void _spinlock_debug __P((spinlock_t *, char *, int)); -__END_DECLS - -#endif /* _SPINLOCK_H_ */ diff --git a/lib/libc/stdio/_flock_stub.c b/lib/libc/stdio/_flock_stub.c deleted file mode 100644 index 96f5c9452e3f..000000000000 --- a/lib/libc/stdio/_flock_stub.c +++ /dev/null @@ -1,81 +0,0 @@ -/* - * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by John Birrell. - * 4. Neither the name of the author nor the names of any co-contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * $Id: _flock_stub.c,v 1.1 1998/04/11 07:40:41 jb Exp $ - * - */ - -#include <stdio.h> - -/* Don't build this in libc_r, just libc: */ -#ifndef _THREAD_SAFE -/* - * Declare weak references in case the application is not linked - * with libpthread. - */ -#pragma weak flockfile=_flockfile_stub -#pragma weak _flockfile_debug=_flockfile_debug_stub -#pragma weak ftrylockfile=_ftrylockfile_stub -#pragma weak funlockfile=_funlockfile_stub - -/* - * This function is a stub for the _flockfile function in libpthread. - */ -void -_flockfile_stub(FILE *fp) -{ -} - -/* - * This function is a stub for the _flockfile_debug function in libpthread. - */ -void -_flockfile_debug_stub(FILE *fp, char *fname, int lineno) -{ -} - -/* - * This function is a stub for the _ftrylockfile function in libpthread. - */ -int -_ftrylockfile_stub(FILE *fp) -{ - return(0); -} - -/* - * This function is a stub for the _funlockfile function in libpthread. - */ -void -_funlockfile_stub(FILE *fp) -{ -} -#endif diff --git a/lib/libc_r/uthread/uthread_recvmsg.c b/lib/libc_r/uthread/uthread_recvmsg.c deleted file mode 100644 index 44a4a6552cc7..000000000000 --- a/lib/libc_r/uthread/uthread_recvmsg.c +++ /dev/null @@ -1,72 +0,0 @@ -/* - * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au> - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by John Birrell. - * 4. Neither the name of the author nor the names of any co-contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - */ -#include <errno.h> -#include <sys/types.h> -#include <sys/socket.h> -#include <fcntl.h> -#ifdef _THREAD_SAFE -#include <pthread.h> -#include "pthread_private.h" - -ssize_t -recvmsg(int fd, struct msghdr *msg, int flags) -{ - int ret; - - if ((ret = _FD_LOCK(fd, FD_READ, NULL)) == 0) { - while ((ret = _thread_sys_recvmsg(fd, msg, flags)) < 0) { - if (!(_thread_fd_table[fd]->flags & O_NONBLOCK) && ((errno == EWOULDBLOCK) || (errno == EAGAIN))) { - _thread_run->data.fd.fd = fd; - - /* Set the timeout: */ - _thread_kern_set_timeout(NULL); - _thread_run->interrupted = 0; - _thread_kern_sched_state(PS_FDR_WAIT, __FILE__, __LINE__); - - /* Check if the wait was interrupted: */ - if (_thread_run->interrupted) { - /* Return an error status: */ - errno = EINTR; - ret = -1; - break; - } - } else { - ret = -1; - break; - } - } - _FD_UNLOCK(fd, FD_READ); - } - return (ret); -} -#endif diff --git a/lib/libc_r/uthread/uthread_sendmsg.c b/lib/libc_r/uthread/uthread_sendmsg.c deleted file mode 100644 index 9d97c121dcff..000000000000 --- a/lib/libc_r/uthread/uthread_sendmsg.c +++ /dev/null @@ -1,71 +0,0 @@ -/* - * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au> - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by John Birrell. - * 4. Neither the name of the author nor the names of any co-contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - */ -#include <errno.h> -#include <sys/types.h> -#include <sys/socket.h> -#include <fcntl.h> -#ifdef _THREAD_SAFE -#include <pthread.h> -#include "pthread_private.h" - -ssize_t -sendmsg(int fd, const struct msghdr *msg, int flags) -{ - int ret; - - if ((ret = _FD_LOCK(fd, FD_WRITE, NULL)) == 0) { - while ((ret = _thread_sys_sendmsg(fd, msg, flags)) < 0) { - if (!(_thread_fd_table[fd]->flags & O_NONBLOCK) && ((errno == EWOULDBLOCK) || (errno == EAGAIN))) { - _thread_run->data.fd.fd = fd; - - /* Set the timeout: */ - _thread_kern_set_timeout(NULL); - _thread_run->interrupted = 0; - _thread_kern_sched_state(PS_FDW_WAIT, __FILE__, __LINE__); - - /* Check if the operation was interrupted: */ - if (_thread_run->interrupted) { - errno = EINTR; - ret = -1; - break; - } - } else { - ret = -1; - break; - } - } - _FD_UNLOCK(fd, FD_WRITE); - } - return (ret); -} -#endif diff --git a/lib/libc_r/uthread/uthread_spinlock.c b/lib/libc_r/uthread/uthread_spinlock.c deleted file mode 100644 index 9da115e5eedb..000000000000 --- a/lib/libc_r/uthread/uthread_spinlock.c +++ /dev/null @@ -1,108 +0,0 @@ -/* - * Copyright (c) 1997 John Birrell <jb@cimlogic.com.au>. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by John Birrell. - * 4. Neither the name of the author nor the names of any co-contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * $Id: uthread_spinlock.c,v 1.3 1998/06/06 07:27:06 jb Exp $ - * - */ - -#include <stdio.h> -#include <sched.h> -#include <unistd.h> -#include <pthread.h> -#include <string.h> -#include "pthread_private.h" - -extern char *__progname; - -/* - * Lock a location for the running thread. Yield to allow other - * threads to run if this thread is blocked because the lock is - * not available. Note that this function does not sleep. It - * assumes that the lock will be available very soon. - */ -void -_spinlock(spinlock_t *lck) -{ - /* - * Try to grab the lock and loop if another thread grabs - * it before we do. - */ - while(_atomic_lock(&lck->access_lock)) { - /* Give up the time slice: */ - sched_yield(); - - /* Check if already locked by the running thread: */ - if (lck->lock_owner == (long) _thread_run) - return; - } - - /* The running thread now owns the lock: */ - lck->lock_owner = (long) _thread_run; -} - -/* - * Lock a location for the running thread. Yield to allow other - * threads to run if this thread is blocked because the lock is - * not available. Note that this function does not sleep. It - * assumes that the lock will be available very soon. - * - * This function checks if the running thread has already locked the - * location, warns if this occurs and creates a thread dump before - * returning. - */ -void -_spinlock_debug(spinlock_t *lck, char *fname, int lineno) -{ - /* - * Try to grab the lock and loop if another thread grabs - * it before we do. - */ - while(_atomic_lock(&lck->access_lock)) { - /* Give up the time slice: */ - sched_yield(); - - /* Check if already locked by the running thread: */ - if (lck->lock_owner == (long) _thread_run) { - char str[256]; - snprintf(str, sizeof(str), "%s - Warning: Thread %p attempted to lock %p from %s (%d) which it had already locked in %s (%d)\n", __progname, _thread_run, lck, fname, lineno, lck->fname, lck->lineno); - _thread_sys_write(2,str,strlen(str)); - - /* Create a thread dump to help debug this problem: */ - _thread_dump_info(); - return; - } - } - - /* The running thread now owns the lock: */ - lck->lock_owner = (long) _thread_run; - lck->fname = fname; - lck->lineno = lineno; -} |
