#include "../perf.h"#include <errno.h>#include <stdlib.h>#include <stdio.h>#include <string.h>#include <linux/kernel.h>#include "session.h"#include "thread.h"#include "thread-stack.h"#include "util.h"#include "debug.h"#include "namespaces.h"#include "comm.h"#include "unwind.h" #include <api/fs/fs.h> int thread__init_map_groups(struct thread *thread, struct machine *machine){	pid_t pid = thread->pid_; 	if (pid == thread->tid || pid == -1) {		thread->mg = map_groups__new(machine);	} else {		struct thread *leader = __machine__findnew_thread(machine, pid, pid);		if (leader) {			thread->mg = map_groups__get(leader->mg);			thread__put(leader);		}	} 	return thread->mg ? 0 : -1;} struct thread *thread__new(pid_t pid, pid_t tid){	char *comm_str;	struct comm *comm;	struct thread *thread = zalloc(sizeof(*thread)); 	if (thread != NULL) {		thread->pid_ = pid;		thread->tid = tid;		thread->ppid = -1;		thread->cpu = -1;		INIT_LIST_HEAD(&thread->namespaces_list);		INIT_LIST_HEAD(&thread->comm_list); 		comm_str = malloc(32);		if (!comm_str)			goto err_thread; 		snprintf(comm_str, 32, ":%d", tid);		comm = comm__new(comm_str, 0, false);		free(comm_str);		if (!comm)			goto err_thread; 		list_add(&comm->list, &thread->comm_list);		refcount_set(&thread->refcnt, 1);		RB_CLEAR_NODE(&thread->rb_node);	} 	return thread; err_thread:	free(thread);	return NULL;} void thread__delete(struct thread *thread){	struct namespaces *namespaces, *tmp_namespaces;	struct comm *comm, *tmp_comm; 	BUG_ON(!RB_EMPTY_NODE(&thread->rb_node)); 	thread_stack__free(thread); 	if (thread->mg) {		map_groups__put(thread->mg);		thread->mg = NULL;	}	list_for_each_entry_safe(namespaces, tmp_namespaces,				 &thread->namespaces_list, list) {		list_del(&namespaces->list);		namespaces__free(namespaces);	}	list_for_each_entry_safe(comm, tmp_comm, &thread->comm_list, list) {		list_del(&comm->list);		comm__free(comm);	}	unwind__finish_access(thread); 	free(thread);} struct thread *thread__get(struct thread *thread){	if (thread)		refcount_inc(&thread->refcnt);	return thread;} void thread__put(struct thread *thread){	if (thread && refcount_dec_and_test(&thread->refcnt)) {		/*		 * Remove it from the dead_threads list, as last reference		 * is gone.		 */		list_del_init(&thread->node);		thread__delete(thread);	}} struct namespaces *thread__namespaces(const struct thread *thread){	if (list_empty(&thread->namespaces_list))		return NULL; 	return list_first_entry(&thread->namespaces_list, struct namespaces, list);} int thread__set_namespaces(struct thread *thread, u64 timestamp,			   struct namespaces_event *event){	struct namespaces *new, *curr = thread__namespaces(thread); 	new = namespaces__new(event);	if (!new)		return -ENOMEM; 	list_add(&new->list, &thread->namespaces_list); 	if (timestamp && curr) {		/*		 * setns syscall must have changed few or all the namespaces		 * of this thread. Update end time for the namespaces		 * previously used.		 */		curr = list_next_entry(new, list);		curr->end_time = timestamp;	} 	return 0;} struct comm *thread__comm(const struct thread *thread){	if (list_empty(&thread->comm_list))		return NULL; 	return list_first_entry(&thread->comm_list, struct comm, list);} struct comm *thread__exec_comm(const struct thread *thread){	struct comm *comm, *last = NULL; 	list_for_each_entry(comm, &thread->comm_list, list) {		if (comm->exec)			return comm;		last = comm;	} 	return last;} int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,		       bool exec){	struct comm *new, *curr = thread__comm(thread); 	/* Override the default :tid entry */	if (!thread->comm_set) {		int err = comm__override(curr, str, timestamp, exec);		if (err)			return err;	} else {		new = comm__new(str, timestamp, exec);		if (!new)			return -ENOMEM;		list_add(&new->list, &thread->comm_list); 		if (exec)			unwind__flush_access(thread);	} 	thread->comm_set = true; 	return 0;} int thread__set_comm_from_proc(struct thread *thread){	char path[64];	char *comm = NULL;	size_t sz;	int err = -1; 	if (!(snprintf(path, sizeof(path), "%d/task/%d/comm",		       thread->pid_, thread->tid) >= (int)sizeof(path)) &&	    procfs__read_str(path, &comm, &sz) == 0) {		comm[sz - 1] = '\0';		err = thread__set_comm(thread, comm, 0);	} 	return err;} const char *thread__comm_str(const struct thread *thread){	const struct comm *comm = thread__comm(thread); 	if (!comm)		return NULL; 	return comm__str(comm);} /* CHECKME: it should probably better return the max comm len from its comm list */int thread__comm_len(struct thread *thread){	if (!thread->comm_len) {		const char *comm = thread__comm_str(thread);		if (!comm)			return 0;		thread->comm_len = strlen(comm);	} 	return thread->comm_len;} size_t thread__fprintf(struct thread *thread, FILE *fp){	return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +	       map_groups__fprintf(thread->mg, fp);} int thread__insert_map(struct thread *thread, struct map *map){	int ret; 	ret = unwind__prepare_access(thread, map, NULL);	if (ret)		return ret; 	map_groups__fixup_overlappings(thread->mg, map, stderr);	map_groups__insert(thread->mg, map); 	return 0;} static int __thread__prepare_access(struct thread *thread){	bool initialized = false;	int i, err = 0; 	for (i = 0; i < MAP__NR_TYPES; ++i) {		struct maps *maps = &thread->mg->maps[i];		struct map *map; 		pthread_rwlock_rdlock(&maps->lock); 		for (map = maps__first(maps); map; map = map__next(map)) {			err = unwind__prepare_access(thread, map, &initialized);			if (err || initialized)				break;		} 		pthread_rwlock_unlock(&maps->lock);	} 	return err;} static int thread__prepare_access(struct thread *thread){	int err = 0; 	if (symbol_conf.use_callchain)		err = __thread__prepare_access(thread); 	return err;} static int thread__clone_map_groups(struct thread *thread,				    struct thread *parent){	int i; 	/* This is new thread, we share map groups for process. */	if (thread->pid_ == parent->pid_)		return thread__prepare_access(thread); 	if (thread->mg == parent->mg) {		pr_debug("broken map groups on thread %d/%d parent %d/%d\n",			 thread->pid_, thread->tid, parent->pid_, parent->tid);		return 0;	} 	/* But this one is new process, copy maps. */	for (i = 0; i < MAP__NR_TYPES; ++i)		if (map_groups__clone(thread, parent->mg, i) < 0)			return -ENOMEM; 	return 0;} int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp){	if (parent->comm_set) {		const char *comm = thread__comm_str(parent);		int err;		if (!comm)			return -ENOMEM;		err = thread__set_comm(thread, comm, timestamp);		if (err)			return err;	} 	thread->ppid = parent->tid;	return thread__clone_map_groups(thread, parent);} void thread__find_cpumode_addr_location(struct thread *thread,					enum map_type type, u64 addr,					struct addr_location *al){	size_t i;	const u8 cpumodes[] = {		PERF_RECORD_MISC_USER,		PERF_RECORD_MISC_KERNEL,		PERF_RECORD_MISC_GUEST_USER,		PERF_RECORD_MISC_GUEST_KERNEL	}; 	for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {		thread__find_addr_location(thread, cpumodes[i], type, addr, al);		if (al->map)			break;	}} struct thread *thread__main_thread(struct machine *machine, struct thread *thread){	if (thread->pid_ == thread->tid)		return thread__get(thread); 	if (thread->pid_ == -1)		return NULL; 	return machine__find_thread(machine, thread->pid_, thread->pid_);}