From: Mathieu Desnoyers Date: Thu, 25 Aug 2011 14:39:04 +0000 (-0400) Subject: Centralize control of contructors/destructors X-Git-Tag: v1.9.1~260 X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=edaa143197d094019217dafbe2b291c660d2cf12;p=lttng-ust.git Centralize control of contructors/destructors Signed-off-by: Mathieu Desnoyers --- diff --git a/include/ust/tracepoint-internal.h b/include/ust/tracepoint-internal.h index 83ea68de..6ed78903 100644 --- a/include/ust/tracepoint-internal.h +++ b/include/ust/tracepoint-internal.h @@ -76,5 +76,6 @@ extern void trace_event_update_process(void); extern int is_trace_event_enabled(const char *channel, const char *name); extern void init_tracepoint(void); +extern void exit_tracepoint(void); #endif /* _UST_TRACEPOINT_INTERNAL_H */ diff --git a/libust/ltt-ring-buffer-client-discard.c b/libust/ltt-ring-buffer-client-discard.c index 1df3fd76..e89026c7 100644 --- a/libust/ltt-ring-buffer-client-discard.c +++ b/libust/ltt-ring-buffer-client-discard.c @@ -12,4 +12,8 @@ #define RING_BUFFER_MODE_TEMPLATE RING_BUFFER_DISCARD #define RING_BUFFER_MODE_TEMPLATE_STRING "discard" +#define RING_BUFFER_MODE_TEMPLATE_INIT \ + ltt_ring_buffer_client_discard_init +#define RING_BUFFER_MODE_TEMPLATE_EXIT \ + ltt_ring_buffer_client_discard_exit #include "ltt-ring-buffer-client.h" diff --git a/libust/ltt-ring-buffer-client-overwrite.c b/libust/ltt-ring-buffer-client-overwrite.c index 602c3cee..8590a7ee 100644 --- a/libust/ltt-ring-buffer-client-overwrite.c +++ b/libust/ltt-ring-buffer-client-overwrite.c @@ -12,4 +12,8 @@ #define RING_BUFFER_MODE_TEMPLATE RING_BUFFER_OVERWRITE #define RING_BUFFER_MODE_TEMPLATE_STRING "overwrite" +#define RING_BUFFER_MODE_TEMPLATE_INIT \ + ltt_ring_buffer_client_overwrite_init +#define RING_BUFFER_MODE_TEMPLATE_EXIT \ + ltt_ring_buffer_client_overwrite_exit #include "ltt-ring-buffer-client.h" diff --git a/libust/ltt-ring-buffer-client.h b/libust/ltt-ring-buffer-client.h index b3e6f007..5260197a 100644 --- a/libust/ltt-ring-buffer-client.h +++ b/libust/ltt-ring-buffer-client.h @@ -508,15 +508,13 @@ static struct ltt_transport ltt_relay_transport = { }, }; -static -void __attribute__((constructor)) ltt_ring_buffer_client_init(void) +void RING_BUFFER_MODE_TEMPLATE_INIT(void) { DBG("LTT : ltt ring buffer client init\n"); ltt_transport_register(<t_relay_transport); } -static -void __attribute__((destructor)) ltt_ring_buffer_client_exit(void) +void RING_BUFFER_MODE_TEMPLATE_EXIT(void) { DBG("LTT : ltt ring buffer client exit\n"); ltt_transport_unregister(<t_relay_transport); diff --git a/libust/ltt-ring-buffer-metadata-client.c b/libust/ltt-ring-buffer-metadata-client.c index 2794a263..e1747c43 100644 --- a/libust/ltt-ring-buffer-metadata-client.c +++ b/libust/ltt-ring-buffer-metadata-client.c @@ -12,4 +12,8 @@ #define RING_BUFFER_MODE_TEMPLATE RING_BUFFER_DISCARD #define RING_BUFFER_MODE_TEMPLATE_STRING "metadata" +#define RING_BUFFER_MODE_TEMPLATE_INIT \ + ltt_ring_buffer_metadata_client_init +#define RING_BUFFER_MODE_TEMPLATE_EXIT \ + ltt_ring_buffer_metadata_client_exit #include "ltt-ring-buffer-metadata-client.h" diff --git a/libust/ltt-ring-buffer-metadata-client.h b/libust/ltt-ring-buffer-metadata-client.h index 00c07fc5..3e16890e 100644 --- a/libust/ltt-ring-buffer-metadata-client.h +++ b/libust/ltt-ring-buffer-metadata-client.h @@ -276,15 +276,13 @@ static struct ltt_transport ltt_relay_transport = { }, }; -static -void __attribute__((constructor)) ltt_ring_buffer_client_init(void) +void RING_BUFFER_MODE_TEMPLATE_INIT(void) { DBG("LTT : ltt ring buffer client init\n"); ltt_transport_register(<t_relay_transport); } -static -void __attribute__((destructor)) ltt_ring_buffer_client_exit(void) +void RING_BUFFER_MODE_TEMPLATE_EXIT(void) { DBG("LTT : ltt ring buffer client exit\n"); ltt_transport_unregister(<t_relay_transport); diff --git a/libust/lttng-ust-comm.c b/libust/lttng-ust-comm.c index 04a32676..ee187f8b 100644 --- a/libust/lttng-ust-comm.c +++ b/libust/lttng-ust-comm.c @@ -23,15 +23,22 @@ #include #include #include -#include -#include -#include #include #include #include #include #include +#include +#include +#include +#include + +/* + * Has lttng ust comm constructor been called ? + */ +static int initialized; + /* * communication thread mutex. Held when handling a command, also held * by fork() to deal with removal of threads, and by exit path. @@ -66,6 +73,7 @@ struct sock_info { int socket; pthread_t ust_listener; /* listener thread */ int root_handle; + int constructor_sem_posted;; }; /* Socket from app (connect) to session daemon (listen) for communication */ @@ -84,6 +92,13 @@ struct sock_info local_apps = { .root_handle = -1, }; +extern void ltt_ring_buffer_client_overwrite_init(void); +extern void ltt_ring_buffer_client_discard_init(void); +extern void ltt_ring_buffer_metadata_client_init(void); +extern void ltt_ring_buffer_client_overwrite_exit(void); +extern void ltt_ring_buffer_client_discard_exit(void); +extern void ltt_ring_buffer_metadata_client_exit(void); + static int setup_local_apps_socket(void) { @@ -142,12 +157,17 @@ int send_reply(int sock, struct lttcomm_ust_reply *lur) } static -int handle_register_done(void) +int handle_register_done(struct sock_info *sock_info) { int ret; + if (sock_info->constructor_sem_posted) + return 0; + sock_info->constructor_sem_posted = 1; ret = uatomic_add_return(&sem_count, -1); + fprintf(stderr, "DEC ret %d\n", ret); if (ret == 0) { + fprintf(stderr, "POST\n"); ret = sem_post(&constructor_wait); assert(!ret); } @@ -180,7 +200,7 @@ int handle_message(struct sock_info *sock_info, switch (lum->cmd) { case LTTNG_UST_REGISTER_DONE: if (lum->handle == LTTNG_UST_ROOT_HANDLE) - ret = handle_register_done(); + ret = handle_register_done(sock_info); else ret = -EINVAL; break; @@ -275,7 +295,7 @@ restart: * If we cannot find the sessiond daemon, don't delay * constructor execution. */ - ret = handle_register_done(); + ret = handle_register_done(sock_info); assert(!ret); pthread_mutex_unlock(<tng_ust_comm_mutex); sleep(5); @@ -305,7 +325,7 @@ restart: * If we cannot register to the sessiond daemon, don't * delay constructor execution. */ - ret = handle_register_done(); + ret = handle_register_done(sock_info); assert(!ret); pthread_mutex_unlock(<tng_ust_comm_mutex); sleep(5); @@ -393,13 +413,26 @@ int get_timeout(struct timespec *constructor_timeout) */ /* TODO */ -void __attribute__((constructor)) lttng_ust_comm_init(void) +void __attribute__((constructor)) lttng_ust_init(void) { struct timespec constructor_timeout; int timeout_mode; int ret; + if (uatomic_xchg(&initialized, 1) == 1) + return; + + /* + * We want precise control over the order in which we construct + * our sub-libraries vs starting to receive commands from + * sessiond (otherwise leading to errors when trying to create + * sessiond before the init functions are completed). + */ init_usterr(); + init_tracepoint(); + ltt_ring_buffer_metadata_client_init(); + ltt_ring_buffer_client_overwrite_init(); + ltt_ring_buffer_client_discard_init(); timeout_mode = get_timeout(&constructor_timeout); @@ -439,7 +472,7 @@ void __attribute__((constructor)) lttng_ust_comm_init(void) } } -void __attribute__((destructor)) lttng_ust_comm_exit(void) +void __attribute__((destructor)) lttng_ust_exit(void) { int ret; @@ -476,4 +509,8 @@ void __attribute__((destructor)) lttng_ust_comm_exit(void) lttng_ust_abi_exit(); ltt_events_exit(); + ltt_ring_buffer_client_discard_exit(); + ltt_ring_buffer_client_overwrite_exit(); + ltt_ring_buffer_metadata_client_exit(); + exit_tracepoint(); } diff --git a/libust/tracepoint.c b/libust/tracepoint.c index 6eb40ea2..2b45a88c 100644 --- a/libust/tracepoint.c +++ b/libust/tracepoint.c @@ -27,6 +27,7 @@ #include #include #include +#include #include @@ -637,6 +638,8 @@ int tracepoint_register_lib(struct tracepoint * const *tracepoints_start, { struct tracepoint_lib *pl, *iter; + init_tracepoint(); + pl = (struct tracepoint_lib *) zmalloc(sizeof(struct tracepoint_lib)); pl->tracepoints_start = tracepoints_start; @@ -688,18 +691,17 @@ int tracepoint_unregister_lib(struct tracepoint * const *tracepoints_start) return 0; } -void __attribute__((constructor)) init_tracepoint(void) +void init_tracepoint(void) { + if (uatomic_xchg(&initialized, 1) == 1) + return; init_usterr(); - if (!initialized) { - tracepoint_register_lib(__start___tracepoints_ptrs, - __stop___tracepoints_ptrs - - __start___tracepoints_ptrs); - initialized = 1; - } + tracepoint_register_lib(__start___tracepoints_ptrs, + __stop___tracepoints_ptrs + - __start___tracepoints_ptrs); } -void __attribute__((destructor)) destroy_tracepoint(void) +void exit_tracepoint(void) { tracepoint_unregister_lib(__start___tracepoints_ptrs); }