diff options
Diffstat (limited to 'source4/smbd/process_thread.c')
| -rw-r--r-- | source4/smbd/process_thread.c | 410 |
1 files changed, 410 insertions, 0 deletions
diff --git a/source4/smbd/process_thread.c b/source4/smbd/process_thread.c new file mode 100644 index 0000000000..cd8865f1e4 --- /dev/null +++ b/source4/smbd/process_thread.c @@ -0,0 +1,410 @@ +/* + Unix SMB/CIFS implementation. + thread model: standard (1 thread per client connection) + Copyright (C) Andrew Tridgell 2003 + Copyright (C) James J Myers 2003 <myersjj@samba.org> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "includes.h" +#include "pthread.h" +#include "execinfo.h" + +static void *connection_thread(void *thread_parm) +{ + struct event_context *ev = thread_parm; + /* wait for action */ + event_loop_wait(ev); + +#if 0 + pthread_cleanup_pop(1); /* will invoke terminate_mt_connection() */ +#endif + return NULL; +} + +static int get_id(struct request_context *req) +{ + return (int)pthread_self(); +} + +/* + called when a listening socket becomes readable +*/ +static void accept_connection(struct event_context *ev, struct fd_event *fde, time_t t, uint16 flags) +{ + int accepted_fd, rc; + struct sockaddr addr; + socklen_t in_addrlen = sizeof(addr); + pthread_t thread_id; + pthread_attr_t thread_attr; + struct model_ops *model_ops = fde->private; + + /* accept an incoming connection */ + accepted_fd = accept(fde->fd,&addr,&in_addrlen); + + if (accepted_fd == -1) { + DEBUG(0,("accept_connection_thread: accept: %s\n", + strerror(errno))); + return; + } + + /* create new detached thread for this connection. The new + thread gets a new event_context with a single fd_event for + receiving from the new socket. We set that thread running + with the main event loop, then return. When we return the + main event_context is continued. + */ + ev = event_context_init(); + MUTEX_LOCK_BY_ID(MUTEX_SMBD); + init_smbsession(ev, model_ops, accepted_fd); + MUTEX_UNLOCK_BY_ID(MUTEX_SMBD); + + pthread_attr_init(&thread_attr); + pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_DETACHED); + rc = pthread_create(&thread_id, &thread_attr, &connection_thread, ev); + pthread_attr_destroy(&thread_attr); + if (rc == 0) { + DEBUG(4,("accept_connection_thread: created thread_id=%lu for fd=%d\n", + (unsigned long int)thread_id, accepted_fd)); + } else { + DEBUG(0,("accept_connection_thread: thread create failed for fd=%d, rc=%d\n", accepted_fd, rc)); + } +} + +/* called when a SMB connection goes down */ +static void terminate_connection(struct server_context *server, const char *reason) +{ + server_terminate(server); + + /* terminate this thread */ + pthread_exit(NULL); /* thread cleanup routine will do actual cleanup */ +} + +/* + mutex init function for thread model +*/ +static int thread_mutex_init(mutex_t *mutex, const char *name) +{ + pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER; + mutex->mutex = memdup(&m, sizeof(m)); + if (! mutex->mutex) { + errno = ENOMEM; + return -1; + } + return pthread_mutex_init((pthread_mutex_t *)mutex->mutex, NULL); +} + +/* + mutex destroy function for thread model +*/ +static int thread_mutex_destroy(mutex_t *mutex, const char *name) +{ + return pthread_mutex_destroy((pthread_mutex_t *)mutex->mutex); +} + +static void mutex_start_timer(struct timeval *tp1) +{ + gettimeofday(tp1,NULL); +} + +static double mutex_end_timer(struct timeval tp1) +{ + struct timeval tp2; + gettimeofday(&tp2,NULL); + return((tp2.tv_sec - tp1.tv_sec) + + (tp2.tv_usec - tp1.tv_usec)*1.0e-6); +} + +/* + mutex lock function for thread model +*/ +static int thread_mutex_lock(mutex_t *mutexP, const char *name) +{ + pthread_mutex_t *mutex = (pthread_mutex_t *)mutexP->mutex; + int rc; + double t; + struct timeval tp1; + /* Test below is ONLY for debugging */ + if ((rc = pthread_mutex_trylock(mutex))) { + if (rc == EBUSY) { + mutex_start_timer(&tp1); + printf("mutex lock: thread %d, lock %s not available\n", + (uint32)pthread_self(), name); + print_suspicious_usage("mutex_lock", name); + pthread_mutex_lock(mutex); + t = mutex_end_timer(tp1); + printf("mutex lock: thread %d, lock %s now available, waited %g seconds\n", + (uint32)pthread_self(), name, t); + return 0; + } + printf("mutex lock: thread %d, lock %s failed rc=%d\n", + (uint32)pthread_self(), name, rc); + SMB_ASSERT(errno == 0); /* force error */ + } + return 0; +} + +/* + mutex unlock for thread model +*/ +static int thread_mutex_unlock(mutex_t *mutex, const char *name) +{ + return pthread_mutex_unlock((pthread_mutex_t *)mutex->mutex); +} + +/***************************************************************** + Read/write lock routines. +*****************************************************************/ +/* + rwlock init function for thread model +*/ +static int thread_rwlock_init(rwlock_t *rwlock, const char *name) +{ + pthread_rwlock_t m = PTHREAD_RWLOCK_INITIALIZER; + rwlock->rwlock = memdup(&m, sizeof(m)); + if (! rwlock->rwlock) { + errno = ENOMEM; + return -1; + } + return pthread_rwlock_init((pthread_rwlock_t *)rwlock->rwlock, NULL); +} + +/* + rwlock destroy function for thread model +*/ +static int thread_rwlock_destroy(rwlock_t *rwlock, const char *name) +{ + return pthread_rwlock_destroy((pthread_rwlock_t *)rwlock->rwlock); +} + +/* + rwlock lock for read function for thread model +*/ +static int thread_rwlock_lock_read(rwlock_t *rwlockP, const char *name) +{ + pthread_rwlock_t *rwlock = (pthread_rwlock_t *)rwlockP->rwlock; + int rc; + double t; + struct timeval tp1; + /* Test below is ONLY for debugging */ + if ((rc = pthread_rwlock_tryrdlock(rwlock))) { + if (rc == EBUSY) { + mutex_start_timer(&tp1); + printf("rwlock lock_read: thread %d, lock %s not available\n", + (uint32)pthread_self(), name); + print_suspicious_usage("rwlock_lock_read", name); + pthread_rwlock_rdlock(rwlock); + t = mutex_end_timer(tp1); + printf("rwlock lock_read: thread %d, lock %s now available, waited %g seconds\n", + (uint32)pthread_self(), name, t); + return 0; + } + printf("rwlock lock_read: thread %d, lock %s failed rc=%d\n", + (uint32)pthread_self(), name, rc); + SMB_ASSERT(errno == 0); /* force error */ + } + return 0; +} + +/* + rwlock lock for write function for thread model +*/ +static int thread_rwlock_lock_write(rwlock_t *rwlockP, const char *name) +{ + pthread_rwlock_t *rwlock = (pthread_rwlock_t *)rwlockP->rwlock; + int rc; + double t; + struct timeval tp1; + /* Test below is ONLY for debugging */ + if ((rc = pthread_rwlock_trywrlock(rwlock))) { + if (rc == EBUSY) { + mutex_start_timer(&tp1); + printf("rwlock lock_write: thread %d, lock %s not available\n", + (uint32)pthread_self(), name); + print_suspicious_usage("rwlock_lock_write", name); + pthread_rwlock_wrlock(rwlock); + t = mutex_end_timer(tp1); + printf("rwlock lock_write: thread %d, lock %s now available, waited %g seconds\n", + (uint32)pthread_self(), name, t); + return 0; + } + printf("rwlock lock_write: thread %d, lock %s failed rc=%d\n", + (uint32)pthread_self(), name, rc); + SMB_ASSERT(errno == 0); /* force error */ + } + return 0; +} + + +/* + rwlock unlock for thread model +*/ +static int thread_rwlock_unlock(rwlock_t *rwlock, const char *name) +{ + return pthread_rwlock_unlock((pthread_rwlock_t *)rwlock->rwlock); +} + +/***************************************************************** + Log suspicious usage (primarily for possible thread-unsafe behavior. +*****************************************************************/ +static void thread_log_suspicious_usage(const char* from, const char* info) +{ + void *addresses[10]; + int num_addresses, i; + char **bt_symbols; + + DEBUG(1,("log_suspicious_usage: from %s info='%s'\n", from, info)); + num_addresses = backtrace(addresses, 8); + bt_symbols = backtrace_symbols(addresses, num_addresses); + for (i=0; i<num_addresses; i++) { + DEBUG(1,("log_suspicious_usage: %s%s\n", DEBUGTAB(1), bt_symbols[i])); + } + free(bt_symbols); +} + +/***************************************************************** + Log suspicious usage to stdout (primarily for possible thread-unsafe behavior. + Used in mutex code where DEBUG calls would cause recursion. +*****************************************************************/ +static void thread_print_suspicious_usage(const char* from, const char* info) +{ + void *addresses[10]; + int num_addresses, i; + char **bt_symbols; + + printf("log_suspicious_usage: from %s info='%s'\n", from, info); + num_addresses = backtrace(addresses, 8); + bt_symbols = backtrace_symbols(addresses, num_addresses); + for (i=0; i<num_addresses; i++) { + printf("log_suspicious_usage: %s%s\n", DEBUGTAB(1), bt_symbols[i]); + } + free(bt_symbols); +} + +uint32 thread_get_task_id(void) +{ + return (uint32)pthread_self(); +} + +/**************************************************************************** +catch serious errors +****************************************************************************/ +static void thread_sig_fault(int sig) +{ + DEBUG(0,("===============================================================\n")); + DEBUG(0,("TERMINAL ERROR: Recursive signal %d in thread %lu (%s)\n",sig,(unsigned long int)pthread_self(),SAMBA_VERSION)); + DEBUG(0,("===============================================================\n")); + exit(1); /* kill the whole server for now */ +} + +/******************************************************************* +setup our recursive fault handlers +********************************************************************/ +static void thread_fault_setup(void) +{ +#ifdef SIGSEGV + CatchSignal(SIGSEGV,SIGNAL_CAST thread_sig_fault); +#endif +#ifdef SIGBUS + CatchSignal(SIGBUS,SIGNAL_CAST thread_sig_fault); +#endif +} + +/******************************************************************* +report a fault in a thread +********************************************************************/ +static void thread_fault_handler(int sig) +{ + static int counter; + void *addresses[10]; + int num_addresses, i; + char **bt_symbols; + + /* try to catch recursive faults */ + thread_fault_setup(); + + counter++; /* count number of faults that have occurred */ + + DEBUG(0,("===============================================================\n")); + DEBUG(0,("INTERNAL ERROR: Signal %d in thread %lu (%s)\n",sig,(unsigned long int)pthread_self(),SAMBA_VERSION)); + DEBUG(0,("Please read the file BUGS.txt in the distribution\n")); + DEBUG(0,("===============================================================\n")); + + num_addresses = backtrace(addresses, 10); + bt_symbols = backtrace_symbols(addresses, num_addresses); + for (i=0; i<num_addresses; i++) { + DEBUG(9,("fault_report: %s\n", bt_symbols[i])); + } + free(bt_symbols); + pthread_exit(NULL); /* terminate failing thread only */ +} + +/* + called when the process model is selected +*/ +static void model_startup(void) +{ + struct mutex_ops m_ops; + struct debug_ops d_ops; + + ZERO_STRUCT(m_ops); + ZERO_STRUCT(d_ops); + + smbd_process_init(); + + /* register mutex/rwlock handlers */ + m_ops.mutex_init = thread_mutex_init; + m_ops.mutex_lock = thread_mutex_lock; + m_ops.mutex_unlock = thread_mutex_unlock; + m_ops.mutex_destroy = thread_mutex_destroy; + + m_ops.rwlock_init = thread_rwlock_init; + m_ops.rwlock_lock_write = thread_rwlock_lock_write; + m_ops.rwlock_lock_read = thread_rwlock_lock_read; + m_ops.rwlock_unlock = thread_rwlock_unlock; + m_ops.rwlock_destroy = thread_rwlock_destroy; + + register_mutex_handlers("thread", &m_ops); + + register_fault_handler("thread", thread_fault_handler); + + d_ops.log_suspicious_usage = thread_log_suspicious_usage; + d_ops.print_suspicious_usage = thread_print_suspicious_usage; + d_ops.get_task_id = thread_get_task_id; + + register_debug_handlers("thread", &d_ops); +} + +/* + initialise the thread process model, registering ourselves with the model subsystem + */ +void process_model_thread_init(void) +{ + struct model_ops ops; + + ZERO_STRUCT(ops); + + /* fill in all the operations */ + ops.model_startup = model_startup; + ops.accept_connection = accept_connection; + ops.terminate_connection = terminate_connection; + ops.exit_server = NULL; + ops.get_id = get_id; + + /* register ourselves with the process model subsystem. We + register under the name 'thread'. */ + register_process_model("thread", &ops); +} |