7 #include "thread-stack.h"
13 #include <api/fs/fs.h>
15 int thread__init_map_groups(struct thread *thread, struct machine *machine)
17 struct thread *leader;
18 pid_t pid = thread->pid_;
20 if (pid == thread->tid || pid == -1) {
21 thread->mg = map_groups__new(machine);
23 leader = __machine__findnew_thread(machine, pid, pid);
25 thread->mg = map_groups__get(leader->mg);
30 return thread->mg ? 0 : -1;
33 struct thread *thread__new(pid_t pid, pid_t tid)
37 struct thread *thread = zalloc(sizeof(*thread));
44 INIT_LIST_HEAD(&thread->comm_list);
46 comm_str = malloc(32);
50 snprintf(comm_str, 32, ":%d", tid);
51 comm = comm__new(comm_str, 0, false);
56 list_add(&comm->list, &thread->comm_list);
57 atomic_set(&thread->refcnt, 1);
58 RB_CLEAR_NODE(&thread->rb_node);
68 void thread__delete(struct thread *thread)
70 struct comm *comm, *tmp;
72 BUG_ON(!RB_EMPTY_NODE(&thread->rb_node));
74 thread_stack__free(thread);
77 map_groups__put(thread->mg);
80 list_for_each_entry_safe(comm, tmp, &thread->comm_list, list) {
81 list_del(&comm->list);
84 unwind__finish_access(thread);
89 struct thread *thread__get(struct thread *thread)
92 atomic_inc(&thread->refcnt);
96 void thread__put(struct thread *thread)
98 if (thread && atomic_dec_and_test(&thread->refcnt)) {
100 * Remove it from the dead_threads list, as last reference
103 list_del_init(&thread->node);
104 thread__delete(thread);
108 struct comm *thread__comm(const struct thread *thread)
110 if (list_empty(&thread->comm_list))
113 return list_first_entry(&thread->comm_list, struct comm, list);
116 struct comm *thread__exec_comm(const struct thread *thread)
118 struct comm *comm, *last = NULL;
120 list_for_each_entry(comm, &thread->comm_list, list) {
129 int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
132 struct comm *new, *curr = thread__comm(thread);
135 /* Override the default :tid entry */
136 if (!thread->comm_set) {
137 err = comm__override(curr, str, timestamp, exec);
141 new = comm__new(str, timestamp, exec);
144 list_add(&new->list, &thread->comm_list);
147 unwind__flush_access(thread);
150 thread->comm_set = true;
155 int thread__set_comm_from_proc(struct thread *thread)
162 if (!(snprintf(path, sizeof(path), "%d/task/%d/comm",
163 thread->pid_, thread->tid) >= (int)sizeof(path)) &&
164 procfs__read_str(path, &comm, &sz) == 0) {
166 err = thread__set_comm(thread, comm, 0);
172 const char *thread__comm_str(const struct thread *thread)
174 const struct comm *comm = thread__comm(thread);
179 return comm__str(comm);
182 /* CHECKME: it should probably better return the max comm len from its comm list */
183 int thread__comm_len(struct thread *thread)
185 if (!thread->comm_len) {
186 const char *comm = thread__comm_str(thread);
189 thread->comm_len = strlen(comm);
192 return thread->comm_len;
195 size_t thread__fprintf(struct thread *thread, FILE *fp)
197 return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
198 map_groups__fprintf(thread->mg, fp);
201 int thread__insert_map(struct thread *thread, struct map *map)
205 ret = unwind__prepare_access(thread, map, NULL);
209 map_groups__fixup_overlappings(thread->mg, map, stderr);
210 map_groups__insert(thread->mg, map);
215 static int __thread__prepare_access(struct thread *thread)
217 bool initialized = false;
220 for (i = 0; i < MAP__NR_TYPES; ++i) {
221 struct maps *maps = &thread->mg->maps[i];
224 pthread_rwlock_rdlock(&maps->lock);
226 for (map = maps__first(maps); map; map = map__next(map)) {
227 err = unwind__prepare_access(thread, map, &initialized);
228 if (err || initialized)
232 pthread_rwlock_unlock(&maps->lock);
238 static int thread__prepare_access(struct thread *thread)
242 if (symbol_conf.use_callchain)
243 err = __thread__prepare_access(thread);
248 static int thread__clone_map_groups(struct thread *thread,
249 struct thread *parent)
253 /* This is new thread, we share map groups for process. */
254 if (thread->pid_ == parent->pid_)
255 return thread__prepare_access(thread);
257 if (thread->mg == parent->mg) {
258 pr_debug("broken map groups on thread %d/%d parent %d/%d\n",
259 thread->pid_, thread->tid, parent->pid_, parent->tid);
263 /* But this one is new process, copy maps. */
264 for (i = 0; i < MAP__NR_TYPES; ++i)
265 if (map_groups__clone(thread, parent->mg, i) < 0)
271 int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp)
275 if (parent->comm_set) {
276 const char *comm = thread__comm_str(parent);
279 err = thread__set_comm(thread, comm, timestamp);
284 thread->ppid = parent->tid;
285 return thread__clone_map_groups(thread, parent);
288 void thread__find_cpumode_addr_location(struct thread *thread,
289 enum map_type type, u64 addr,
290 struct addr_location *al)
293 const u8 cpumodes[] = {
294 PERF_RECORD_MISC_USER,
295 PERF_RECORD_MISC_KERNEL,
296 PERF_RECORD_MISC_GUEST_USER,
297 PERF_RECORD_MISC_GUEST_KERNEL
300 for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
301 thread__find_addr_location(thread, cpumodes[i], type, addr, al);
307 struct thread *thread__main_thread(struct machine *machine, struct thread *thread)
309 if (thread->pid_ == thread->tid)
310 return thread__get(thread);
312 if (thread->pid_ == -1)
315 return machine__find_thread(machine, thread->pid_, thread->pid_);