X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=libust%2Ftracectl.c;h=e0b9370963a482a206be9b358d4705ecae727e9c;hb=dc2848112a55ee60632491148089cc60984f683d;hp=c34a3ce4ad3f673393ef3df9da5f89baa965d7e8;hpb=9fb49d0eb803eec381fcdc340fff3c7fe9c33742;p=ust.git diff --git a/libust/tracectl.c b/libust/tracectl.c index c34a3ce..e0b9370 100644 --- a/libust/tracectl.c +++ b/libust/tracectl.c @@ -17,17 +17,16 @@ #define _GNU_SOURCE #include +#include #include #include #include #include #include -#include #include #include #include - -#include +#include #include #include @@ -37,8 +36,6 @@ #include "buffers.h" #include "marker-control.h" -//#define USE_CLONE - #define USTSIGNAL SIGIO #define MAX_MSG_SIZE (100) @@ -125,15 +122,6 @@ static void print_markers(FILE *fp) static int init_socket(void); -/* This needs to be called whenever a new thread is created. It notifies - * liburcu of the new thread. - */ - -void ust_register_thread(void) -{ - rcu_register_thread(); -} - int fd_notif = -1; void notif_cb(void) { @@ -241,9 +229,13 @@ void process_blocked_consumers(void) continue; } if(result == 0) { + int res; DBG("PRODUCER END"); - close(bc->fd_producer); + res = close(bc->fd_producer); + if(res == -1) { + PERROR("close"); + } list_del(&bc->list); @@ -357,10 +349,7 @@ static int do_cmd_get_shmid(const char *recvbuf, struct ustcomm_source *src) } } - if(found) { - buffers_to_export--; - } - else { + if(!found) { ERR("channel not found (%s)", channel_and_cpu); } @@ -662,7 +651,7 @@ static int do_cmd_get_subbuffer(const char *recvbuf, struct ustcomm_source *src) if(trace == NULL) { int result; - WARN("Cannot find trace. It was likely destroyed by the user."); + DBG("Cannot find trace. It was likely destroyed by the user."); result = ustcomm_send_reply(&ustcomm_app.server, "NOTFOUND", src); if(result) { ERR("ustcomm_send_reply failed"); @@ -695,6 +684,14 @@ static int do_cmd_get_subbuffer(const char *recvbuf, struct ustcomm_source *src) list_add(&bc->list, &blocked_consumers); + /* Being here is the proof the daemon has mapped the buffer in its + * memory. We may now decrement buffers_to_export. + */ + if(uatomic_read(&buf->consumed) == 0) { + DBG("decrementing buffers_to_export"); + buffers_to_export--; + } + break; } } @@ -761,7 +758,7 @@ static int do_cmd_put_subbuffer(const char *recvbuf, struct ustcomm_source *src) trace = _ltt_trace_find(trace_name); if(trace == NULL) { - WARN("Cannot find trace. It was likely destroyed by the user."); + DBG("Cannot find trace. It was likely destroyed by the user."); result = ustcomm_send_reply(&ustcomm_app.server, "NOTFOUND", src); if(result) { ERR("ustcomm_send_reply failed"); @@ -819,14 +816,19 @@ static int do_cmd_put_subbuffer(const char *recvbuf, struct ustcomm_source *src) return retval; } +static void listener_cleanup(void *ptr) +{ + ustcomm_fini_app(&ustcomm_app, 0); +} + void *listener_main(void *p) { int result; - ust_register_thread(); - DBG("LISTENER"); + pthread_cleanup_push(listener_cleanup, NULL); + for(;;) { char trace_name[] = "auto"; char trace_type[] = "ustrelay"; @@ -1101,34 +1103,29 @@ void *listener_main(void *p) next_cmd: free(recvbuf); } + + pthread_cleanup_pop(1); } volatile sig_atomic_t have_listener = 0; +/* These should only be accessed in the parent thread, + * not the listener. + */ +static pthread_t listener_thread; void create_listener(void) { -#ifdef USE_CLONE - static char listener_stack[16384]; int result; -#else - pthread_t thread; -#endif if(have_listener) { WARN("not creating listener because we already had one"); return; } -#ifdef USE_CLONE - result = clone((int (*)(void *)) listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL); + result = pthread_create(&listener_thread, NULL, listener_main, NULL); if(result == -1) { - perror("clone"); - return; + PERROR("pthread_create"); } -#else - - pthread_create(&thread, NULL, listener_main, NULL); -#endif have_listener = 1; } @@ -1186,16 +1183,8 @@ static void __attribute__((constructor)) init() */ pidunique = make_pidunique(); - /* Initialize RCU in case the constructor order is not good. */ - rcu_init(); - - /* It is important to do this before events start to be generated. */ - ust_register_thread(); - DBG("Tracectl constructor"); - /* Must create socket before signal handler to prevent races. - */ result = init_socket(); if(result == -1) { ERR("init_socket error"); @@ -1395,6 +1384,20 @@ int restarting_usleep(useconds_t usecs) return result; } +static void stop_listener() +{ + int result; + + result = pthread_cancel(listener_thread); + if(result == -1) { + PERROR("pthread_cancel"); + } + result = pthread_join(listener_thread, NULL); + if(result == -1) { + PERROR("pthread_join"); + } +} + /* This destructor keeps the process alive for a few seconds in order * to leave time to ustd to connect to its buffers. This is necessary * for programs whose execution is very short. It is also useful in all @@ -1425,7 +1428,8 @@ static void __attribute__((destructor)) keepalive() destroy_traces(); - ustcomm_fini_app(&ustcomm_app); + /* Ask the listener to stop and clean up. */ + stop_listener(); } void ust_potential_exec(void) @@ -1466,13 +1470,19 @@ static void ust_fork(void) /* Delete all blocked consumers */ list_for_each_entry(bc, &blocked_consumers, list) { - close(bc->fd_producer); - close(bc->fd_consumer); + result = close(bc->fd_producer); + if(result == -1) { + PERROR("close"); + } free(deletable_bc); deletable_bc = bc; list_del(&bc->list); } + /* free app, keeping socket file */ + ustcomm_fini_app(&ustcomm_app, 1); + + buffers_to_export = 0; have_listener = 0; init_socket(); create_listener();