From 809abada865727ea986d69afcf2a9a3b00df560a Mon Sep 17 00:00:00 2001 From: dimitri staessens Date: Tue, 25 Jul 2017 19:54:39 +0200 Subject: lib: Add threadpool manager This adds a threadpool manager component in the library that is used in the IRMd and IPCPs. The threadpool manager now doesn't detach threads but does a join when they exit. This solves a data race in the previous implementation where some threads were not completely finished upon release of some resources. --- src/irmd/main.c | 209 +++++++------------------------------------------------- 1 file changed, 26 insertions(+), 183 deletions(-) (limited to 'src/irmd') diff --git a/src/irmd/main.c b/src/irmd/main.c index b72893ba..8b22bdef 100644 --- a/src/irmd/main.c +++ b/src/irmd/main.c @@ -36,6 +36,7 @@ #include #include #include +#include #include #include "utils.h" @@ -99,18 +100,9 @@ struct irm { struct shm_rdrbuff * rdrb; /* rdrbuff for SDUs */ int sockfd; /* UNIX socket */ - pthread_t * threadpool; /* pool of mainloop threads */ - - struct bmp * thread_ids; /* ids for mainloop threads */ - size_t max_threads; /* max threads set by tpm */ - size_t threads; /* available mainloop threads */ - pthread_cond_t threads_cond; /* signal thread entry/exit */ - pthread_mutex_t threads_lock; /* mutex for threads/condvar */ - enum irm_state state; /* state of the irmd */ pthread_rwlock_t state_lock; /* lock for the entire irmd */ - pthread_t tpm; /* threadpool manager */ pthread_t irm_sanitize; /* clean up irmd resources */ pthread_t shm_sanitize; /* keep track of rdrbuff use */ } irmd; @@ -478,7 +470,7 @@ static int enroll_ipcp(pid_t api, pthread_rwlock_unlock(&irmd.reg_lock); if (ipcp_enroll(api, dst_name, &info) < 0) { - log_err("Could not enroll IPCP."); + log_err("Could not enroll IPCP %d.", api); return -1; } @@ -1426,16 +1418,6 @@ static void irm_fini(void) if (irmd_get_state() != IRMD_NULL) log_warn("Unsafe destroy."); - pthread_mutex_lock(&irmd.threads_lock); - - if (irmd.thread_ids != NULL) - bmp_destroy(irmd.thread_ids); - - pthread_mutex_unlock(&irmd.threads_lock); - - if (irmd.threadpool != NULL) - free(irmd.threadpool); - pthread_rwlock_wrlock(&irmd.flows_lock); if (irmd.port_ids != NULL) @@ -1509,8 +1491,8 @@ void irmd_sig_handler(int sig, } log_info("IRMd shutting down..."); - irmd_set_state(IRMD_NULL); + tpm_stop(); break; case SIGPIPE: log_dbg("Ignored SIGPIPE."); @@ -1692,55 +1674,11 @@ void * irm_sanitize(void * o) } } -static void thread_inc(void) -{ - pthread_mutex_lock(&irmd.threads_lock); - - ++irmd.threads; - pthread_cond_signal(&irmd.threads_cond); - - pthread_mutex_unlock(&irmd.threads_lock); -} - -static void thread_dec(void) -{ - pthread_mutex_lock(&irmd.threads_lock); - - --irmd.threads; - pthread_cond_signal(&irmd.threads_cond); - - pthread_mutex_unlock(&irmd.threads_lock); -} - -static bool thread_check(void) -{ - int ret; - - pthread_mutex_lock(&irmd.threads_lock); - - ret = irmd.threads > irmd.max_threads; - - pthread_mutex_unlock(&irmd.threads_lock); - - return ret; -} - -static void thread_exit(ssize_t id) -{ - pthread_mutex_lock(&irmd.threads_lock); - bmp_release(irmd.thread_ids, id); - - --irmd.threads; - pthread_cond_signal(&irmd.threads_cond); - - pthread_mutex_unlock(&irmd.threads_lock); -} - void * mainloop(void * o) { uint8_t buf[IRM_MSG_BUF_SIZE]; - ssize_t id = (ssize_t) o; + (void) o; while (true) { #ifdef __FreeBSD__ @@ -1760,8 +1698,8 @@ void * mainloop(void * o) struct timeval tv = {(SOCKET_TIMEOUT / 1000), (SOCKET_TIMEOUT % 1000) * 1000}; - if (irmd_get_state() != IRMD_RUNNING || thread_check()) { - thread_exit(id); + if (irmd_get_state() != IRMD_RUNNING || tpm_check()) { + tpm_exit(); break; } @@ -1772,7 +1710,6 @@ void * mainloop(void * o) if (select(irmd.sockfd + 1, &fds, NULL, NULL, &timeout) <= 0) continue; #endif - cli_sockfd = accept(irmd.sockfd, 0, 0); if (cli_sockfd < 0) continue; @@ -1790,7 +1727,7 @@ void * mainloop(void * o) if (irmd_get_state() != IRMD_RUNNING) { close(cli_sockfd); - thread_exit(id); + tpm_exit(); break; } @@ -1800,7 +1737,7 @@ void * mainloop(void * o) continue; } - thread_dec(); + tpm_dec(); if (msg->has_timeo_sec) { assert(msg->has_timeo_nsec); @@ -1929,7 +1866,7 @@ void * mainloop(void * o) if (ret_msg.result == -EPIPE || !ret_msg.has_result) { close(cli_sockfd); - thread_inc(); + tpm_inc(); continue; } @@ -1939,7 +1876,7 @@ void * mainloop(void * o) if (apis != NULL) free(apis); close(cli_sockfd); - thread_inc(); + tpm_inc(); continue; } @@ -1948,7 +1885,7 @@ void * mainloop(void * o) if (apis != NULL) free(apis); close(cli_sockfd); - thread_inc(); + tpm_inc(); continue; } @@ -1963,70 +1900,7 @@ void * mainloop(void * o) free(buffer.data); close(cli_sockfd); - thread_inc(); - } - - return (void *) 0; -} - -void * threadpoolmgr(void * o) -{ - pthread_attr_t pattr; - struct timespec dl; - struct timespec to = {(IRMD_TPM_TIMEOUT / 1000), - (IRMD_TPM_TIMEOUT % 1000) * MILLION}; - (void) o; - - if (pthread_attr_init(&pattr)) - return (void *) -1; - - pthread_attr_setdetachstate(&pattr, PTHREAD_CREATE_DETACHED); - - while (true) { - clock_gettime(PTHREAD_COND_CLOCK, &dl); - ts_add(&dl, &to, &dl); - - if (irmd_get_state() != IRMD_RUNNING) { - pthread_attr_destroy(&pattr); - log_dbg("Waiting for threads to exit."); - pthread_mutex_lock(&irmd.threads_lock); - while (irmd.threads > 0) - pthread_cond_wait(&irmd.threads_cond, - &irmd.threads_lock); - pthread_mutex_unlock(&irmd.threads_lock); - log_dbg("Threadpool manager done."); - break; - } - - pthread_mutex_lock(&irmd.threads_lock); - - if (irmd.threads < IRMD_MIN_AV_THREADS) { - log_dbg("Increasing threadpool."); - irmd.max_threads = IRMD_MAX_AV_THREADS; - - while (irmd.threads < irmd.max_threads) { - ssize_t id = bmp_allocate(irmd.thread_ids); - if (!bmp_is_id_valid(irmd.thread_ids, id)) { - log_warn("IRMd threadpool exhausted."); - break; - } - - if (pthread_create(&irmd.threadpool[id], - &pattr, mainloop, - (void *) id)) - log_warn("Failed to start new thread."); - else - ++irmd.threads; - } - } - - if (pthread_cond_timedwait(&irmd.threads_cond, - &irmd.threads_lock, - &dl) == ETIMEDOUT) - if (irmd.threads > IRMD_MIN_AV_THREADS ) - --irmd.max_threads; - - pthread_mutex_unlock(&irmd.threads_lock); + tpm_inc(); } return (void *) 0; @@ -2035,7 +1909,6 @@ void * threadpoolmgr(void * o) static int irm_init(void) { struct stat st; - pthread_condattr_t cattr; struct timeval timeout = {(IRMD_ACCEPT_TIMEOUT / 1000), (IRMD_ACCEPT_TIMEOUT % 1000) * 1000}; @@ -2058,24 +1931,6 @@ static int irm_init(void) goto fail_flows_lock; } - if (pthread_mutex_init(&irmd.threads_lock, NULL)) { - log_err("Failed to initialize mutex."); - goto fail_threads_lock; - } - - if (pthread_condattr_init(&cattr)) { - log_err("Failed to initialize condattr."); - goto fail_cattr; - } - -#ifndef __APPLE__ - pthread_condattr_setclock(&cattr, PTHREAD_COND_CLOCK); -#endif - if (pthread_cond_init(&irmd.threads_cond, &cattr)) { - log_err("Failed to initialize cond."); - goto fail_threads_cond; - } - list_head_init(&irmd.ipcps); list_head_init(&irmd.api_table); list_head_init(&irmd.apn_table); @@ -2089,18 +1944,6 @@ static int irm_init(void) goto fail_port_ids; } - irmd.thread_ids = bmp_create(IRMD_MAX_THREADS, 0); - if (irmd.thread_ids == NULL) { - log_err("Failed to thread thread_ids bitmap."); - goto fail_thread_ids; - } - - irmd.threadpool = malloc(sizeof(pthread_t) * IRMD_MAX_THREADS); - if (irmd.threadpool == NULL) { - log_err("Failed to malloc threadpool"); - goto fail_thrpool; - } - if ((irmd.lf = lockfile_create()) == NULL) { if ((irmd.lf = lockfile_open()) == NULL) { log_err("Lockfile error."); @@ -2155,8 +1998,6 @@ static int irm_init(void) goto fail_rdrbuff; } - irmd.threads = 0; - irmd.max_threads = IRMD_MIN_AV_THREADS; irmd.state = IRMD_RUNNING; log_info("Ouroboros IPC Resource Manager daemon started..."); @@ -2172,18 +2013,8 @@ fail_sock_path: fail_stat: lockfile_destroy(irmd.lf); fail_lockfile: - free(irmd.threadpool); -fail_thrpool: - bmp_destroy(irmd.thread_ids); -fail_thread_ids: bmp_destroy(irmd.port_ids); fail_port_ids: - pthread_cond_destroy(&irmd.threads_cond); -fail_threads_cond: - pthread_condattr_destroy(&cattr); -fail_cattr: - pthread_mutex_destroy(&irmd.threads_lock); -fail_threads_lock: pthread_rwlock_destroy(&irmd.flows_lock); fail_flows_lock: pthread_rwlock_destroy(&irmd.reg_lock); @@ -2253,12 +2084,24 @@ int main(int argc, exit(EXIT_FAILURE); } - pthread_create(&irmd.tpm, NULL, threadpoolmgr, NULL); + if (tpm_init(IRMD_MIN_THREADS, IRMD_ADD_THREADS, mainloop)) { + log_fini(); + exit(EXIT_FAILURE); + } + + if (tpm_start()) { + tpm_fini(); + log_fini(); + exit(EXIT_FAILURE); + } pthread_create(&irmd.irm_sanitize, NULL, irm_sanitize, NULL); pthread_create(&irmd.shm_sanitize, NULL, shm_sanitize, irmd.rdrb); - pthread_join(irmd.tpm, NULL); + /* tpm_stop() called from sighandler */ + + tpm_fini(); + pthread_join(irmd.irm_sanitize, NULL); pthread_join(irmd.shm_sanitize, NULL); -- cgit v1.2.3