X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Fthread%2Fpthread_create.c;h=7494a486b2b3a4d4b4fee7c05d64538cb51e9eed;hp=6fa484c72a38df8bc6d45fb06df7537443415a06;hb=29fae65780f4c5ccda3758828da7a83073297ccc;hpb=0b44a0315b47dd8eced9f3b7f31580cf14bbfc01

diff --git a/src/thread/pthread_create.c b/src/thread/pthread_create.c
index 6fa484c7..7494a486 100644
--- a/src/thread/pthread_create.c
+++ b/src/thread/pthread_create.c
@@ -1,6 +1,43 @@
 #include "pthread_impl.h"
 
-#define pthread_self __pthread_self
+void __pthread_unwind_next(struct __ptcb *cb)
+{
+	int i, j, not_finished;
+	pthread_t self;
+
+	if (cb->__next) longjmp((void *)cb->__next->__jb, 1);
+
+	self = pthread_self();
+	if (self->cancel) self->result = PTHREAD_CANCELLED;
+
+	LOCK(&self->exitlock);
+
+	not_finished = self->tsd_used;
+	for (j=0; not_finished && j<PTHREAD_DESTRUCTOR_ITERATIONS; j++) {
+		not_finished = 0;
+		for (i=0; i<PTHREAD_KEYS_MAX; i++) {
+			if (self->tsd[i] && libc.tsd_keys[i]) {
+				void *tmp = self->tsd[i];
+				self->tsd[i] = 0;
+				libc.tsd_keys[i](tmp);
+				not_finished = 1;
+			}
+		}
+	}
+
+	/* Mark this thread dead before decrementing count */
+	self->dead = 1;
+
+	if (!a_fetch_add(&libc.threads_minus_1, -1))
+		exit(0);
+
+	if (self->detached && self->map_base) {
+		syscall4(__NR_rt_sigprocmask, SIG_BLOCK, (long)(uint64_t[1]){-1},0,8);
+		__unmapself(self->map_base, self->map_size);
+	}
+
+	__syscall_exit(0);
+}
 
 static void docancel(struct pthread *self)
 {
@@ -10,13 +47,22 @@ static void docancel(struct pthread *self)
 
 static void cancel_handler(int sig, siginfo_t *si, void *ctx)
 {
-	struct pthread *self = pthread_self();
+	struct pthread *self = __pthread_self();
+	if (si->si_code > 0 || si->si_pid != self->pid) return;
 	self->cancel = 1;
 	if (self->canceldisable || (!self->cancelasync && !self->cancelpoint))
 		return;
 	docancel(self);
 }
 
+static void cancelpt(int x)
+{
+	struct pthread *self = __pthread_self();
+	if (self->canceldisable) return;
+	self->cancelpoint = x;
+	if (self->cancel) docancel(self);
+}
+
 /* "rsyscall" is a mechanism by which a thread can synchronously force all
  * other threads to perform an arbitrary syscall. It is necessary to work
  * around the non-conformant implementation of setuid() et al on Linux,
@@ -33,7 +79,17 @@ static struct {
 
 static void rsyscall_handler(int sig, siginfo_t *si, void *ctx)
 {
-	if (rs.cnt == libc.threads_minus_1) return;
+	struct pthread *self = __pthread_self();
+
+	if (si->si_code > 0 || si->si_pid != self->pid ||
+		rs.cnt == libc.threads_minus_1) return;
+
+	/* Threads which have already decremented themselves from the
+	 * thread count must not increment rs.cnt or otherwise act. */
+	if (self->dead) {
+		__wait(&rs.hold, 0, 1, 1);
+		return;
+	}
 
 	if (syscall6(rs.nr, rs.arg[0], rs.arg[1], rs.arg[2],
 		rs.arg[3], rs.arg[4], rs.arg[5]) < 0 && !rs.err) rs.err=errno;
@@ -50,7 +106,7 @@ static int rsyscall(int nr, long a, long b, long c, long d, long e, long f)
 {
 	int i, ret;
 	sigset_t set = { 0 };
-	struct pthread *self = pthread_self();
+	struct pthread *self = __pthread_self();
 	sigaddset(&set, SIGSYSCALL);
 
 	LOCK(&rs.lock);
@@ -90,18 +146,11 @@ static int rsyscall(int nr, long a, long b, long c, long d, long e, long f)
 	return ret;
 }
 
-static void cancelpt(int x)
-{
-	struct pthread *self = pthread_self();
-	if (self->canceldisable) return;
-	self->cancelpoint = x;
-	if (self->cancel) docancel(self);
-}
-
 static void init_threads()
 {
 	struct sigaction sa = { .sa_flags = SA_SIGINFO | SA_RESTART };
 	libc.lock = __lock;
+	libc.lockfile = __lockfile;
 	libc.cancelpt = cancelpt;
 	libc.rsyscall = rsyscall;
 	sa.sa_sigaction = cancel_handler;
@@ -120,10 +169,7 @@ static int start(void *p)
 	return 0;
 }
 
-#undef pthread_self
-
-#define CLONE_MAGIC 0x7d0f00
-int __clone(int (*)(void *), void *, int, void *, pid_t *, void *, pid_t *);
+int __uniclone(void *, int (*)(), void *);
 
 #define ROUND(x) (((x)+PAGE_SIZE-1)&-PAGE_SIZE)
 
@@ -144,12 +190,12 @@ int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(vo
 	if (!init && ++init) init_threads();
 
 	if (!attr) attr = &default_attr;
-	guard = ROUND(attr->__guardsize + DEFAULT_GUARD_SIZE);
-	size = guard + ROUND(attr->__stacksize + DEFAULT_STACK_SIZE);
+	guard = ROUND(attr->_a_guardsize + DEFAULT_GUARD_SIZE);
+	size = guard + ROUND(attr->_a_stacksize + DEFAULT_STACK_SIZE);
 	size += __pthread_tsd_size;
 	map = mmap(0, size, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON, -1, 0);
 	if (!map) return EAGAIN;
-	mprotect(map, guard, PROT_NONE);
+	if (guard) mprotect(map, guard, PROT_NONE);
 
 	tsd = map + size - __pthread_tsd_size;
 	new = (void *)(tsd - sizeof *new - PAGE_SIZE%sizeof *new);
@@ -161,7 +207,7 @@ int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(vo
 	new->start_arg = arg;
 	new->self = new;
 	new->tsd = (void *)tsd;
-	new->detached = attr->__detach;
+	new->detached = attr->_a_detach;
 	new->attr = *attr;
 	memcpy(new->tlsdesc, self->tlsdesc, sizeof new->tlsdesc);
 	new->tlsdesc[1] = (uintptr_t)new;
@@ -173,8 +219,7 @@ int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(vo
 	while (rs.lock) __wait(&rs.lock, 0, 1, 1);
 
 	a_inc(&libc.threads_minus_1);
-	ret = __clone(start, stack, CLONE_MAGIC, new,
-		&new->tid, &new->tlsdesc, &new->tid);
+	ret = __uniclone(stack, start, new);
 
 	a_dec(&rs.blocks);
 	if (rs.lock) __wake(&rs.blocks, 1, 1);
@@ -182,8 +227,15 @@ int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(vo
 	if (ret < 0) {
 		a_dec(&libc.threads_minus_1);
 		munmap(map, size);
-		return -ret;
+		return EAGAIN;
 	}
 	*res = new;
 	return 0;
 }
+
+void pthread_exit(void *result)
+{
+	struct pthread *self = pthread_self();
+	self->result = result;
+	docancel(self);
+}