X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=libust%2Ftracepoint.c;h=ca40902494f61b9785a1e0b863852dca4694aff3;hb=f218ff2821b494cf7b0fc3978e944070ad418772;hp=ebcbe252f1a0eba3d58711d9bb2e3106c5fb66e7;hpb=769d015768372ce7f68ff12bbc55aa339c3a6bcd;p=ust.git diff --git a/libust/tracepoint.c b/libust/tracepoint.c index ebcbe25..ca40902 100644 --- a/libust/tracepoint.c +++ b/libust/tracepoint.c @@ -2,43 +2,32 @@ * Copyright (C) 2008 Mathieu Desnoyers * Copyright (C) 2009 Pierre-Marc Fournier * - * 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 library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. * - * This program is distributed in the hope that it will be useful, + * This library 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. + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * Ported to userspace by Pierre-Marc Fournier. */ -//ust// #include -//ust// #include -//ust// #include -//ust// #include -//ust// #include -//ust// #include -//ust// #include -//ust// #include -//ust// #include -//ust// #include - #include - -#include "kernelcompat.h" -#include "tracepoint.h" +#include +#include +#include #include "usterr.h" -//#include "list.h" #define _LGPL_SOURCE -#include +#include +#include //extern struct tracepoint __start___tracepoints[] __attribute__((visibility("hidden"))); //extern struct tracepoint __stop___tracepoints[] __attribute__((visibility("hidden"))); @@ -47,7 +36,7 @@ static const int tracepoint_debug; /* libraries that contain tracepoints (struct tracepoint_lib) */ -static LIST_HEAD(libs); +static CDS_LIST_HEAD(libs); /* * tracepoints_mutex nests inside module_mutex. Tracepoints mutex protects the @@ -61,7 +50,7 @@ static DEFINE_MUTEX(tracepoints_mutex); */ #define TRACEPOINT_HASH_BITS 6 #define TRACEPOINT_TABLE_SIZE (1 << TRACEPOINT_HASH_BITS) -static struct hlist_head tracepoint_table[TRACEPOINT_TABLE_SIZE]; +static struct cds_hlist_head tracepoint_table[TRACEPOINT_TABLE_SIZE]; /* * Note about RCU : @@ -70,8 +59,8 @@ static struct hlist_head tracepoint_table[TRACEPOINT_TABLE_SIZE]; * Tracepoint entries modifications are protected by the tracepoints_mutex. */ struct tracepoint_entry { - struct hlist_node hlist; - void **funcs; + struct cds_hlist_node hlist; + struct probe *probes; int refcount; /* Number of times armed. 0 if disarmed. */ char name[0]; }; @@ -79,15 +68,15 @@ struct tracepoint_entry { struct tp_probes { union { //ust// struct rcu_head rcu; - struct list_head list; + struct cds_list_head list; } u; - void *probes[0]; + struct probe probes[0]; }; static inline void *allocate_probes(int count) { - struct tp_probes *p = kmalloc(count * sizeof(void *) - + sizeof(struct tp_probes), GFP_KERNEL); + struct tp_probes *p = zmalloc(count * sizeof(struct probe) + + sizeof(struct tp_probes)); return p == NULL ? NULL : p->probes; } @@ -99,11 +88,11 @@ static inline void *allocate_probes(int count) static inline void release_probes(void *old) { if (old) { - struct tp_probes *tp_probes = container_of(old, + struct tp_probes *tp_probes = _ust_container_of(old, struct tp_probes, probes[0]); //ust// call_rcu_sched(&tp_probes->u.rcu, rcu_free_old_probes); synchronize_rcu(); - kfree(tp_probes); + free(tp_probes); } } @@ -111,27 +100,29 @@ static void debug_print_probes(struct tracepoint_entry *entry) { int i; - if (!tracepoint_debug || !entry->funcs) + if (!tracepoint_debug || !entry->probes) return; - for (i = 0; entry->funcs[i]; i++) - printk(KERN_DEBUG "Probe %d : %p\n", i, entry->funcs[i]); + for (i = 0; entry->probes[i].func; i++) + DBG("Probe %d : %p", i, entry->probes[i].func); } static void * -tracepoint_entry_add_probe(struct tracepoint_entry *entry, void *probe) +tracepoint_entry_add_probe(struct tracepoint_entry *entry, + void *probe, void *data) { int nr_probes = 0; - void **old, **new; + struct probe *old, *new; WARN_ON(!probe); debug_print_probes(entry); - old = entry->funcs; + old = entry->probes; if (old) { /* (N -> N+1), (N != 0, 1) probes */ - for (nr_probes = 0; old[nr_probes]; nr_probes++) - if (old[nr_probes] == probe) + for (nr_probes = 0; old[nr_probes].func; nr_probes++) + if (old[nr_probes].func == probe && + old[nr_probes].data == data) return ERR_PTR(-EEXIST); } /* + 2 : one for new probe, one for NULL func */ @@ -139,36 +130,40 @@ tracepoint_entry_add_probe(struct tracepoint_entry *entry, void *probe) if (new == NULL) return ERR_PTR(-ENOMEM); if (old) - memcpy(new, old, nr_probes * sizeof(void *)); - new[nr_probes] = probe; - new[nr_probes + 1] = NULL; + memcpy(new, old, nr_probes * sizeof(struct probe)); + new[nr_probes].func = probe; + new[nr_probes].data = data; + new[nr_probes + 1].func = NULL; entry->refcount = nr_probes + 1; - entry->funcs = new; + entry->probes = new; debug_print_probes(entry); return old; } static void * -tracepoint_entry_remove_probe(struct tracepoint_entry *entry, void *probe) +tracepoint_entry_remove_probe(struct tracepoint_entry *entry, void *probe, + void *data) { int nr_probes = 0, nr_del = 0, i; - void **old, **new; + struct probe *old, *new; - old = entry->funcs; + old = entry->probes; if (!old) return ERR_PTR(-ENOENT); debug_print_probes(entry); /* (N -> M), (N > 1, M >= 0) probes */ - for (nr_probes = 0; old[nr_probes]; nr_probes++) { - if ((!probe || old[nr_probes] == probe)) + for (nr_probes = 0; old[nr_probes].func; nr_probes++) { + if (!probe || + (old[nr_probes].func == probe && + old[nr_probes].data == data)) nr_del++; } if (nr_probes - nr_del == 0) { /* N -> 0, (N > 1) */ - entry->funcs = NULL; + entry->probes = NULL; entry->refcount = 0; debug_print_probes(entry); return old; @@ -179,12 +174,13 @@ tracepoint_entry_remove_probe(struct tracepoint_entry *entry, void *probe) new = allocate_probes(nr_probes - nr_del + 1); if (new == NULL) return ERR_PTR(-ENOMEM); - for (i = 0; old[i]; i++) - if ((probe && old[i] != probe)) + for (i = 0; old[i].func; i++) + if (probe && + (old[i].func != probe || old[i].data != data)) new[j++] = old[i]; - new[nr_probes - nr_del] = NULL; + new[nr_probes - nr_del].func = NULL; entry->refcount = nr_probes - nr_del; - entry->funcs = new; + entry->probes = new; } debug_print_probes(entry); return old; @@ -197,13 +193,13 @@ tracepoint_entry_remove_probe(struct tracepoint_entry *entry, void *probe) */ static struct tracepoint_entry *get_tracepoint(const char *name) { - struct hlist_head *head; - struct hlist_node *node; + struct cds_hlist_head *head; + struct cds_hlist_node *node; struct tracepoint_entry *e; u32 hash = jhash(name, strlen(name), 0); head = &tracepoint_table[hash & (TRACEPOINT_TABLE_SIZE - 1)]; - hlist_for_each_entry(e, node, head, hlist) { + cds_hlist_for_each_entry(e, node, head, hlist) { if (!strcmp(name, e->name)) return e; } @@ -216,31 +212,30 @@ static struct tracepoint_entry *get_tracepoint(const char *name) */ static struct tracepoint_entry *add_tracepoint(const char *name) { - struct hlist_head *head; - struct hlist_node *node; + struct cds_hlist_head *head; + struct cds_hlist_node *node; struct tracepoint_entry *e; size_t name_len = strlen(name) + 1; u32 hash = jhash(name, name_len-1, 0); head = &tracepoint_table[hash & (TRACEPOINT_TABLE_SIZE - 1)]; - hlist_for_each_entry(e, node, head, hlist) { + cds_hlist_for_each_entry(e, node, head, hlist) { if (!strcmp(name, e->name)) { - printk(KERN_NOTICE - "tracepoint %s busy\n", name); + DBG("tracepoint %s busy", name); return ERR_PTR(-EEXIST); /* Already there */ } } /* - * Using kmalloc here to allocate a variable length element. Could + * Using zmalloc here to allocate a variable length element. Could * cause some memory fragmentation if overused. */ - e = kmalloc(sizeof(struct tracepoint_entry) + name_len, GFP_KERNEL); + e = zmalloc(sizeof(struct tracepoint_entry) + name_len); if (!e) return ERR_PTR(-ENOMEM); memcpy(&e->name[0], name, name_len); - e->funcs = NULL; + e->probes = NULL; e->refcount = 0; - hlist_add_head(&e->hlist, head); + cds_hlist_add_head(&e->hlist, head); return e; } @@ -250,8 +245,8 @@ static struct tracepoint_entry *add_tracepoint(const char *name) */ static inline void remove_tracepoint(struct tracepoint_entry *e) { - hlist_del(&e->hlist); - kfree(e); + cds_hlist_del(&e->hlist); + free(e); } /* @@ -263,13 +258,13 @@ static void set_tracepoint(struct tracepoint_entry **entry, WARN_ON(strcmp((*entry)->name, elem->name) != 0); /* - * rcu_assign_pointer has a smp_wmb() which makes sure that the new + * rcu_assign_pointer has a cmm_smp_wmb() which makes sure that the new * probe callbacks array is consistent before setting a pointer to it. * This array is referenced by __DO_TRACE from - * include/linux/tracepoints.h. A matching smp_read_barrier_depends() + * include/linux/tracepoints.h. A matching cmm_smp_read_barrier_depends() * is used. */ - rcu_assign_pointer(elem->funcs, (*entry)->funcs); + rcu_assign_pointer(elem->probes, (*entry)->probes); elem->state__imv = active; } @@ -282,7 +277,7 @@ static void set_tracepoint(struct tracepoint_entry **entry, static void disable_tracepoint(struct tracepoint *elem) { elem->state__imv = 0; - rcu_assign_pointer(elem->funcs, NULL); + rcu_assign_pointer(elem->probes, NULL); } /** @@ -292,23 +287,38 @@ static void disable_tracepoint(struct tracepoint *elem) * * Updates the probe callback corresponding to a range of tracepoints. */ -void tracepoint_update_probe_range(struct tracepoint *begin, - struct tracepoint *end) +void tracepoint_update_probe_range(struct tracepoint * const *begin, + struct tracepoint * const *end) { - struct tracepoint *iter; + struct tracepoint * const *iter; struct tracepoint_entry *mark_entry; - mutex_lock(&tracepoints_mutex); + pthread_mutex_lock(&tracepoints_mutex); for (iter = begin; iter < end; iter++) { - mark_entry = get_tracepoint(iter->name); + if (!(*iter)->name) { + disable_tracepoint(*iter); + continue; + } + mark_entry = get_tracepoint((*iter)->name); if (mark_entry) { - set_tracepoint(&mark_entry, iter, + set_tracepoint(&mark_entry, *iter, !!mark_entry->refcount); } else { - disable_tracepoint(iter); + disable_tracepoint(*iter); } } - mutex_unlock(&tracepoints_mutex); + pthread_mutex_unlock(&tracepoints_mutex); +} + +static void lib_update_tracepoints(void) +{ + struct tracepoint_lib *lib; + +//ust// pthread_mutex_lock(&module_mutex); + cds_list_for_each_entry(lib, &libs, list) + tracepoint_update_probe_range(lib->tracepoints_start, + lib->tracepoints_start + lib->tracepoints_count); +//ust// pthread_mutex_unlock(&module_mutex); } /* @@ -326,18 +336,19 @@ static void tracepoint_update_probes(void) //ust// module_imv_update(); } -static void *tracepoint_add_probe(const char *name, void *probe) +static struct probe * +tracepoint_add_probe(const char *name, void *probe, void *data) { struct tracepoint_entry *entry; - void *old; + struct probe *old; entry = get_tracepoint(name); if (!entry) { entry = add_tracepoint(name); if (IS_ERR(entry)) - return entry; + return (struct probe *)entry; } - old = tracepoint_entry_add_probe(entry, probe); + old = tracepoint_entry_add_probe(entry, probe, data); if (IS_ERR(old) && !entry->refcount) remove_tracepoint(entry); return old; @@ -351,13 +362,13 @@ static void *tracepoint_add_probe(const char *name, void *probe) * Returns 0 if ok, error value on error. * The probe address must at least be aligned on the architecture pointer size. */ -int tracepoint_probe_register(const char *name, void *probe) +int tracepoint_probe_register(const char *name, void *probe, void *data) { void *old; - mutex_lock(&tracepoints_mutex); - old = tracepoint_add_probe(name, probe); - mutex_unlock(&tracepoints_mutex); + pthread_mutex_lock(&tracepoints_mutex); + old = tracepoint_add_probe(name, probe, data); + pthread_mutex_unlock(&tracepoints_mutex); if (IS_ERR(old)) return PTR_ERR(old); @@ -367,7 +378,7 @@ int tracepoint_probe_register(const char *name, void *probe) } //ust// EXPORT_SYMBOL_GPL(tracepoint_probe_register); -static void *tracepoint_remove_probe(const char *name, void *probe) +static void *tracepoint_remove_probe(const char *name, void *probe, void *data) { struct tracepoint_entry *entry; void *old; @@ -375,7 +386,7 @@ static void *tracepoint_remove_probe(const char *name, void *probe) entry = get_tracepoint(name); if (!entry) return ERR_PTR(-ENOENT); - old = tracepoint_entry_remove_probe(entry, probe); + old = tracepoint_entry_remove_probe(entry, probe, data); if (IS_ERR(old)) return old; if (!entry->refcount) @@ -387,19 +398,20 @@ static void *tracepoint_remove_probe(const char *name, void *probe) * tracepoint_probe_unregister - Disconnect a probe from a tracepoint * @name: tracepoint name * @probe: probe function pointer + * @probe: probe data pointer * * We do not need to call a synchronize_sched to make sure the probes have * finished running before doing a module unload, because the module unload * itself uses stop_machine(), which insures that every preempt disabled section * have finished. */ -int tracepoint_probe_unregister(const char *name, void *probe) +int tracepoint_probe_unregister(const char *name, void *probe, void *data) { void *old; - mutex_lock(&tracepoints_mutex); - old = tracepoint_remove_probe(name, probe); - mutex_unlock(&tracepoints_mutex); + pthread_mutex_lock(&tracepoints_mutex); + old = tracepoint_remove_probe(name, probe, data); + pthread_mutex_unlock(&tracepoints_mutex); if (IS_ERR(old)) return PTR_ERR(old); @@ -409,16 +421,16 @@ int tracepoint_probe_unregister(const char *name, void *probe) } //ust// EXPORT_SYMBOL_GPL(tracepoint_probe_unregister); -static LIST_HEAD(old_probes); +static CDS_LIST_HEAD(old_probes); static int need_update; static void tracepoint_add_old_probes(void *old) { need_update = 1; if (old) { - struct tp_probes *tp_probes = container_of(old, + struct tp_probes *tp_probes = _ust_container_of(old, struct tp_probes, probes[0]); - list_add(&tp_probes->u.list, &old_probes); + cds_list_add(&tp_probes->u.list, &old_probes); } } @@ -429,18 +441,19 @@ static void tracepoint_add_old_probes(void *old) * * caller must call tracepoint_probe_update_all() */ -int tracepoint_probe_register_noupdate(const char *name, void *probe) +int tracepoint_probe_register_noupdate(const char *name, void *probe, + void *data) { void *old; - mutex_lock(&tracepoints_mutex); - old = tracepoint_add_probe(name, probe); + pthread_mutex_lock(&tracepoints_mutex); + old = tracepoint_add_probe(name, probe, data); if (IS_ERR(old)) { - mutex_unlock(&tracepoints_mutex); + pthread_mutex_unlock(&tracepoints_mutex); return PTR_ERR(old); } tracepoint_add_old_probes(old); - mutex_unlock(&tracepoints_mutex); + pthread_mutex_unlock(&tracepoints_mutex); return 0; } //ust// EXPORT_SYMBOL_GPL(tracepoint_probe_register_noupdate); @@ -452,18 +465,19 @@ int tracepoint_probe_register_noupdate(const char *name, void *probe) * * caller must call tracepoint_probe_update_all() */ -int tracepoint_probe_unregister_noupdate(const char *name, void *probe) +int tracepoint_probe_unregister_noupdate(const char *name, void *probe, + void *data) { void *old; - mutex_lock(&tracepoints_mutex); - old = tracepoint_remove_probe(name, probe); + pthread_mutex_lock(&tracepoints_mutex); + old = tracepoint_remove_probe(name, probe, data); if (IS_ERR(old)) { - mutex_unlock(&tracepoints_mutex); + pthread_mutex_unlock(&tracepoints_mutex); return PTR_ERR(old); } tracepoint_add_old_probes(old); - mutex_unlock(&tracepoints_mutex); + pthread_mutex_unlock(&tracepoints_mutex); return 0; } //ust// EXPORT_SYMBOL_GPL(tracepoint_probe_unregister_noupdate); @@ -473,29 +487,56 @@ int tracepoint_probe_unregister_noupdate(const char *name, void *probe) */ void tracepoint_probe_update_all(void) { - LIST_HEAD(release_probes); + CDS_LIST_HEAD(release_probes); struct tp_probes *pos, *next; - mutex_lock(&tracepoints_mutex); + pthread_mutex_lock(&tracepoints_mutex); if (!need_update) { - mutex_unlock(&tracepoints_mutex); + pthread_mutex_unlock(&tracepoints_mutex); return; } - if (!list_empty(&old_probes)) - list_replace_init(&old_probes, &release_probes); + if (!cds_list_empty(&old_probes)) + cds_list_replace_init(&old_probes, &release_probes); need_update = 0; - mutex_unlock(&tracepoints_mutex); + pthread_mutex_unlock(&tracepoints_mutex); tracepoint_update_probes(); - list_for_each_entry_safe(pos, next, &release_probes, u.list) { - list_del(&pos->u.list); + cds_list_for_each_entry_safe(pos, next, &release_probes, u.list) { + cds_list_del(&pos->u.list); //ust// call_rcu_sched(&pos->u.rcu, rcu_free_old_probes); synchronize_rcu(); - kfree(pos); + free(pos); } } //ust// EXPORT_SYMBOL_GPL(tracepoint_probe_update_all); +/* + * Returns 0 if current not found. + * Returns 1 if current found. + */ +int lib_get_iter_tracepoints(struct tracepoint_iter *iter) +{ + struct tracepoint_lib *iter_lib; + int found = 0; + +//ust// pthread_mutex_lock(&module_mutex); + cds_list_for_each_entry(iter_lib, &libs, list) { + if (iter_lib < iter->lib) + continue; + else if (iter_lib > iter->lib) + iter->tracepoint = NULL; + found = tracepoint_get_iter_range(&iter->tracepoint, + iter_lib->tracepoints_start, + iter_lib->tracepoints_start + iter_lib->tracepoints_count); + if (found) { + iter->lib = iter_lib; + break; + } + } +//ust// pthread_mutex_unlock(&module_mutex); + return found; +} + /** * tracepoint_get_iter_range - Get a next tracepoint iterator given a range. * @tracepoint: current tracepoints (in), next tracepoint (out) @@ -506,8 +547,8 @@ void tracepoint_probe_update_all(void) * Will return the first tracepoint in the range if the input tracepoint is * NULL. */ -int tracepoint_get_iter_range(struct tracepoint **tracepoint, - struct tracepoint *begin, struct tracepoint *end) +int tracepoint_get_iter_range(struct tracepoint * const **tracepoint, + struct tracepoint * const *begin, struct tracepoint * const *end) { if (!*tracepoint && begin != end) { *tracepoint = begin; @@ -532,7 +573,7 @@ static void tracepoint_get_iter(struct tracepoint_iter *iter) //ust// } /* tracepoints in libs. */ found = lib_get_iter_tracepoints(iter); -end: +//ust// end: if (!found) tracepoint_iter_reset(iter); } @@ -600,44 +641,6 @@ void tracepoint_iter_reset(struct tracepoint_iter *iter) //ust// #endif /* CONFIG_MODULES */ -/* - * Returns 0 if current not found. - * Returns 1 if current found. - */ -int lib_get_iter_tracepoints(struct tracepoint_iter *iter) -{ - struct tracepoint_lib *iter_lib; - int found = 0; - -//ust// mutex_lock(&module_mutex); - list_for_each_entry(iter_lib, &libs, list) { - if (iter_lib < iter->lib) - continue; - else if (iter_lib > iter->lib) - iter->tracepoint = NULL; - found = marker_get_iter_range(&iter->tracepoint, - iter_lib->tracepoints_start, - iter_lib->tracepoints_start + iter_lib->tracepoints_count); - if (found) { - iter->lib = iter_lib; - break; - } - } -//ust// mutex_unlock(&module_mutex); - return found; -} - -void lib_update_tracepoints(void) -{ - struct tracepoint_lib *lib; - -//ust// mutex_lock(&module_mutex); - list_for_each_entry(lib, &libs, list) - tracepoint_update_probe_range(lib->tracepoints_start, - lib->tracepoints_start + lib->tracepoints_count); -//ust// mutex_unlock(&module_mutex); -} - static void (*new_tracepoint_cb)(struct tracepoint *) = NULL; void tracepoint_set_new_tracepoint_cb(void (*cb)(struct tracepoint *)) @@ -645,29 +648,29 @@ void tracepoint_set_new_tracepoint_cb(void (*cb)(struct tracepoint *)) new_tracepoint_cb = cb; } -static void new_tracepoints(struct tracepoint *start, struct tracepoint *end) +static void new_tracepoints(struct tracepoint * const *start, struct tracepoint * const *end) { - if(new_tracepoint_cb) { - struct tracepoint *t; + if (new_tracepoint_cb) { + struct tracepoint * const *t; for(t=start; t < end; t++) { - new_tracepoint_cb(t); + new_tracepoint_cb(*t); } } } -int tracepoint_register_lib(struct tracepoint *tracepoints_start, int tracepoints_count) +int tracepoint_register_lib(struct tracepoint * const *tracepoints_start, int tracepoints_count) { struct tracepoint_lib *pl; - pl = (struct tracepoint_lib *) malloc(sizeof(struct tracepoint_lib)); + pl = (struct tracepoint_lib *) zmalloc(sizeof(struct tracepoint_lib)); pl->tracepoints_start = tracepoints_start; pl->tracepoints_count = tracepoints_count; /* FIXME: maybe protect this with its own mutex? */ - mutex_lock(&tracepoints_mutex); - list_add(&pl->list, &libs); - mutex_unlock(&tracepoints_mutex); + pthread_mutex_lock(&tracepoints_mutex); + cds_list_add(&pl->list, &libs); + pthread_mutex_unlock(&tracepoints_mutex); new_tracepoints(tracepoints_start, tracepoints_start + tracepoints_count); @@ -675,14 +678,26 @@ int tracepoint_register_lib(struct tracepoint *tracepoints_start, int tracepoint lib_update_tracepoints(); DBG("just registered a tracepoints section from %p and having %d tracepoints", tracepoints_start, tracepoints_count); - + return 0; } -int tracepoint_unregister_lib(struct tracepoint *tracepoints_start, int tracepoints_count) +int tracepoint_unregister_lib(struct tracepoint * const *tracepoints_start) { - /*FIXME: implement; but before implementing, tracepoint_register_lib must - have appropriate locking. */ + struct tracepoint_lib *lib; + + pthread_mutex_lock(&tracepoints_mutex); + + cds_list_for_each_entry(lib, &libs, list) { + if (lib->tracepoints_start == tracepoints_start) { + struct tracepoint_lib *lib2free = lib; + cds_list_del(&lib->list); + free(lib2free); + break; + } + } + + pthread_mutex_unlock(&tracepoints_mutex); return 0; }