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Date: Mon, 01 Sep 2014 00:46:23 +0200
From: Jens Gustedt <Jens.Gustedt@...ia.fr>
To: musl@...ts.openwall.com
Subject: [PATCH 3/9] use weak symbols for the POSIX functions that will be
used by C threads
The intent of this is to avoid name space pollution of the C threads
implementation.
This has two sides to it. First we have to provide symbols that wouldn't
pollute the name space for the C threads implementation. Second we have
to clean up some internal uses of POSIX functions such that they don't
implicitly drag in such symbols.
---
src/mman/mprotect.c | 4 +++-
src/thread/__timedwait.c | 9 ++++++---
src/thread/pthread_cond_timedwait.c | 12 +++++++++---
src/thread/pthread_create.c | 21 ++++++++++++++-------
src/thread/pthread_detach.c | 8 ++++++--
src/thread/pthread_getspecific.c | 5 ++++-
src/thread/pthread_join.c | 8 ++++++--
src/thread/pthread_key_create.c | 7 +++++--
src/thread/pthread_mutex_lock.c | 8 ++++++--
src/thread/pthread_mutex_timedlock.c | 4 +++-
src/thread/pthread_mutex_trylock.c | 4 +++-
src/thread/pthread_mutex_unlock.c | 4 +++-
src/thread/pthread_once.c | 4 +++-
src/thread/pthread_setcancelstate.c | 4 +++-
src/thread/pthread_testcancel.c | 4 +++-
15 files changed, 77 insertions(+), 29 deletions(-)
diff --git a/src/mman/mprotect.c b/src/mman/mprotect.c
index f488486..535787b 100644
--- a/src/mman/mprotect.c
+++ b/src/mman/mprotect.c
@@ -2,10 +2,12 @@
#include "libc.h"
#include "syscall.h"
-int mprotect(void *addr, size_t len, int prot)
+int __mprotect(void *addr, size_t len, int prot)
{
size_t start, end;
start = (size_t)addr & -PAGE_SIZE;
end = (size_t)((char *)addr + len + PAGE_SIZE-1) & -PAGE_SIZE;
return syscall(SYS_mprotect, start, end-start, prot);
}
+
+weak_alias(__mprotect, mprotect);
diff --git a/src/thread/__timedwait.c b/src/thread/__timedwait.c
index d6f1233..3d62272 100644
--- a/src/thread/__timedwait.c
+++ b/src/thread/__timedwait.c
@@ -4,6 +4,9 @@
#include "futex.h"
#include "syscall.h"
+int __pthread_setcancelstate(int new, int *old);
+int __clock_gettime(clockid_t clk, struct timespec *ts);
+
int __timedwait(volatile int *addr, int val,
clockid_t clk, const struct timespec *at,
void (*cleanup)(void *), void *arg, int priv)
@@ -15,7 +18,7 @@ int __timedwait(volatile int *addr, int val,
if (at) {
if (at->tv_nsec >= 1000000000UL) return EINVAL;
- if (clock_gettime(clk, &to)) return EINVAL;
+ if (__clock_gettime(clk, &to)) return EINVAL;
to.tv_sec = at->tv_sec - to.tv_sec;
if ((to.tv_nsec = at->tv_nsec - to.tv_nsec) < 0) {
to.tv_sec--;
@@ -25,7 +28,7 @@ int __timedwait(volatile int *addr, int val,
top = &to;
}
- if (!cleanup) pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
+ if (!cleanup) __pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
pthread_cleanup_push(cleanup, arg);
r = -__syscall_cp(SYS_futex, addr, FUTEX_WAIT|priv, val, top);
@@ -33,7 +36,7 @@ int __timedwait(volatile int *addr, int val,
if (r != EINTR && r != ETIMEDOUT) r = 0;
pthread_cleanup_pop(0);
- if (!cleanup) pthread_setcancelstate(cs, 0);
+ if (!cleanup) __pthread_setcancelstate(cs, 0);
return r;
}
diff --git a/src/thread/pthread_cond_timedwait.c b/src/thread/pthread_cond_timedwait.c
index 2d192b0..393d60e 100644
--- a/src/thread/pthread_cond_timedwait.c
+++ b/src/thread/pthread_cond_timedwait.c
@@ -1,5 +1,9 @@
#include "pthread_impl.h"
+void __pthread_testcancel(void);
+int __pthread_mutex_lock(pthread_mutex_t *);
+int __pthread_mutex_unlock(pthread_mutex_t *m);
+
/*
* struct waiter
*
@@ -119,7 +123,7 @@ static void unwait(void *arg)
}
}
-int pthread_cond_timedwait(pthread_cond_t *restrict c, pthread_mutex_t *restrict m, const struct timespec *restrict ts)
+int __pthread_cond_timedwait(pthread_cond_t *restrict c, pthread_mutex_t *restrict m, const struct timespec *restrict ts)
{
struct waiter node = { .cond = c, .mutex = m };
int e, seq, *fut, clock = c->_c_clock;
@@ -130,7 +134,7 @@ int pthread_cond_timedwait(pthread_cond_t *restrict c, pthread_mutex_t *restrict
if (ts && ts->tv_nsec >= 1000000000UL)
return EINVAL;
- pthread_testcancel();
+ __pthread_testcancel();
if (c->_c_shared) {
node.shared = 1;
@@ -151,7 +155,7 @@ int pthread_cond_timedwait(pthread_cond_t *restrict c, pthread_mutex_t *restrict
unlock(&c->_c_lock);
}
- pthread_mutex_unlock(m);
+ __pthread_mutex_unlock(m);
do e = __timedwait(fut, seq, clock, ts, unwait, &node, !node.shared);
while (*fut==seq && (!e || e==EINTR));
@@ -197,3 +201,5 @@ int __private_cond_signal(pthread_cond_t *c, int n)
return 0;
}
+
+weak_alias(__pthread_cond_timedwait, pthread_cond_timedwait);
diff --git a/src/thread/pthread_create.c b/src/thread/pthread_create.c
index e441bda..ed265fb 100644
--- a/src/thread/pthread_create.c
+++ b/src/thread/pthread_create.c
@@ -5,6 +5,10 @@
#include <sys/mman.h>
#include <string.h>
+void *__mmap(void *, size_t, int, int, int, off_t);
+int __munmap(void *, size_t);
+int __mprotect(void *, size_t, int);
+
static void dummy_0()
{
}
@@ -14,7 +18,7 @@ weak_alias(dummy_0, __pthread_tsd_run_dtors);
weak_alias(dummy_0, __do_private_robust_list);
weak_alias(dummy_0, __do_orphaned_stdio_locks);
-_Noreturn void pthread_exit(void *result)
+_Noreturn void __pthread_exit(void *result)
{
pthread_t self = __pthread_self();
sigset_t set;
@@ -139,7 +143,7 @@ static void init_file_lock(FILE *f)
void *__copy_tls(unsigned char *);
-int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attrp, void *(*entry)(void *), void *restrict arg)
+static int __pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attrp, void *(*entry)(void *), void *restrict arg)
{
int ret;
size_t size, guard;
@@ -191,14 +195,14 @@ int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attrp
if (!tsd) {
if (guard) {
- map = mmap(0, size, PROT_NONE, MAP_PRIVATE|MAP_ANON, -1, 0);
+ map = __mmap(0, size, PROT_NONE, MAP_PRIVATE|MAP_ANON, -1, 0);
if (map == MAP_FAILED) goto fail;
- if (mprotect(map+guard, size-guard, PROT_READ|PROT_WRITE)) {
- munmap(map, size);
+ if (__mprotect(map+guard, size-guard, PROT_READ|PROT_WRITE)) {
+ __munmap(map, size);
goto fail;
}
} else {
- map = mmap(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
+ map = __mmap(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
if (map == MAP_FAILED) goto fail;
}
tsd = map + size - __pthread_tsd_size;
@@ -240,7 +244,7 @@ int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attrp
if (ret < 0) {
a_dec(&libc.threads_minus_1);
- if (map) munmap(map, size);
+ if (map) __munmap(map, size);
return EAGAIN;
}
@@ -258,3 +262,6 @@ fail:
__release_ptc();
return EAGAIN;
}
+
+weak_alias(__pthread_exit, pthread_exit);
+weak_alias(__pthread_create, pthread_create);
diff --git a/src/thread/pthread_detach.c b/src/thread/pthread_detach.c
index 651c38e..5ca7855 100644
--- a/src/thread/pthread_detach.c
+++ b/src/thread/pthread_detach.c
@@ -1,11 +1,15 @@
#include "pthread_impl.h"
-int pthread_detach(pthread_t t)
+int __pthread_join(pthread_t t, void **res);
+
+int __pthread_detach(pthread_t t)
{
/* Cannot detach a thread that's already exiting */
if (a_swap(t->exitlock, 1))
- return pthread_join(t, 0);
+ return __pthread_join(t, 0);
t->detached = 2;
__unlock(t->exitlock);
return 0;
}
+
+weak_alias(__pthread_detach, pthread_detach);
diff --git a/src/thread/pthread_getspecific.c b/src/thread/pthread_getspecific.c
index b2a282c..bfc4294 100644
--- a/src/thread/pthread_getspecific.c
+++ b/src/thread/pthread_getspecific.c
@@ -1,7 +1,10 @@
#include "pthread_impl.h"
-void *pthread_getspecific(pthread_key_t k)
+static void *__pthread_getspecific(pthread_key_t k)
{
struct pthread *self = __pthread_self();
return self->tsd[k];
}
+
+weak_alias(__pthread_getspecific, pthread_getspecific);
+weak_alias(__pthread_getspecific, tss_get);
diff --git a/src/thread/pthread_join.c b/src/thread/pthread_join.c
index 719c91c..bca89aa 100644
--- a/src/thread/pthread_join.c
+++ b/src/thread/pthread_join.c
@@ -1,15 +1,19 @@
#include "pthread_impl.h"
#include <sys/mman.h>
+int __munmap(void *, size_t);
+
static void dummy(void *p)
{
}
-int pthread_join(pthread_t t, void **res)
+int __pthread_join(pthread_t t, void **res)
{
int tmp;
while ((tmp = t->tid)) __timedwait(&t->tid, tmp, 0, 0, dummy, 0, 0);
if (res) *res = t->result;
- if (t->map_base) munmap(t->map_base, t->map_size);
+ if (t->map_base) __munmap(t->map_base, t->map_size);
return 0;
}
+
+weak_alias(__pthread_join, pthread_join);
diff --git a/src/thread/pthread_key_create.c b/src/thread/pthread_key_create.c
index a9187f7..bfcd597 100644
--- a/src/thread/pthread_key_create.c
+++ b/src/thread/pthread_key_create.c
@@ -9,7 +9,7 @@ static void nodtor(void *dummy)
{
}
-int pthread_key_create(pthread_key_t *k, void (*dtor)(void *))
+int __pthread_key_create(pthread_key_t *k, void (*dtor)(void *))
{
unsigned i = (uintptr_t)&k / 16 % PTHREAD_KEYS_MAX;
unsigned j = i;
@@ -31,7 +31,7 @@ int pthread_key_create(pthread_key_t *k, void (*dtor)(void *))
return EAGAIN;
}
-int pthread_key_delete(pthread_key_t k)
+int __pthread_key_delete(pthread_key_t k)
{
keys[k] = 0;
return 0;
@@ -53,3 +53,6 @@ void __pthread_tsd_run_dtors()
}
}
}
+
+weak_alias(__pthread_key_delete, pthread_key_delete);
+weak_alias(__pthread_key_create, pthread_key_create);
diff --git a/src/thread/pthread_mutex_lock.c b/src/thread/pthread_mutex_lock.c
index 2a9a3aa..993f54c 100644
--- a/src/thread/pthread_mutex_lock.c
+++ b/src/thread/pthread_mutex_lock.c
@@ -1,10 +1,14 @@
#include "pthread_impl.h"
-int pthread_mutex_lock(pthread_mutex_t *m)
+int __pthread_mutex_timedlock(pthread_mutex_t *restrict m, const struct timespec *restrict at);
+
+int __pthread_mutex_lock(pthread_mutex_t *m)
{
if ((m->_m_type&15) == PTHREAD_MUTEX_NORMAL
&& !a_cas(&m->_m_lock, 0, EBUSY))
return 0;
- return pthread_mutex_timedlock(m, 0);
+ return __pthread_mutex_timedlock(m, 0);
}
+
+weak_alias(__pthread_mutex_lock, pthread_mutex_lock);
diff --git a/src/thread/pthread_mutex_timedlock.c b/src/thread/pthread_mutex_timedlock.c
index ae883f9..16241ee 100644
--- a/src/thread/pthread_mutex_timedlock.c
+++ b/src/thread/pthread_mutex_timedlock.c
@@ -1,6 +1,6 @@
#include "pthread_impl.h"
-int pthread_mutex_timedlock(pthread_mutex_t *restrict m, const struct timespec *restrict at)
+int __pthread_mutex_timedlock(pthread_mutex_t *restrict m, const struct timespec *restrict at)
{
if ((m->_m_type&15) == PTHREAD_MUTEX_NORMAL
&& !a_cas(&m->_m_lock, 0, EBUSY))
@@ -30,3 +30,5 @@ int pthread_mutex_timedlock(pthread_mutex_t *restrict m, const struct timespec *
}
return r;
}
+
+weak_alias(__pthread_mutex_timedlock, pthread_mutex_timedlock);
diff --git a/src/thread/pthread_mutex_trylock.c b/src/thread/pthread_mutex_trylock.c
index e851517..9be7930 100644
--- a/src/thread/pthread_mutex_trylock.c
+++ b/src/thread/pthread_mutex_trylock.c
@@ -50,9 +50,11 @@ int __pthread_mutex_trylock_owner(pthread_mutex_t *m)
return 0;
}
-int pthread_mutex_trylock(pthread_mutex_t *m)
+static int __pthread_mutex_trylock(pthread_mutex_t *m)
{
if ((m->_m_type&15) == PTHREAD_MUTEX_NORMAL)
return a_cas(&m->_m_lock, 0, EBUSY) & EBUSY;
return __pthread_mutex_trylock_owner(m);
}
+
+weak_alias(__pthread_mutex_trylock, pthread_mutex_trylock);
diff --git a/src/thread/pthread_mutex_unlock.c b/src/thread/pthread_mutex_unlock.c
index 46761d9..a7f39c7 100644
--- a/src/thread/pthread_mutex_unlock.c
+++ b/src/thread/pthread_mutex_unlock.c
@@ -3,7 +3,7 @@
void __vm_lock_impl(int);
void __vm_unlock_impl(void);
-int pthread_mutex_unlock(pthread_mutex_t *m)
+int __pthread_mutex_unlock(pthread_mutex_t *m)
{
pthread_t self;
int waiters = m->_m_waiters;
@@ -36,3 +36,5 @@ int pthread_mutex_unlock(pthread_mutex_t *m)
__wake(&m->_m_lock, 1, priv);
return 0;
}
+
+weak_alias(__pthread_mutex_unlock, pthread_mutex_unlock);
diff --git a/src/thread/pthread_once.c b/src/thread/pthread_once.c
index 2eb0f93..05ebe69 100644
--- a/src/thread/pthread_once.c
+++ b/src/thread/pthread_once.c
@@ -6,7 +6,7 @@ static void undo(void *control)
__wake(control, 1, 1);
}
-int pthread_once(pthread_once_t *control, void (*init)(void))
+int __pthread_once(pthread_once_t *control, void (*init)(void))
{
static int waiters;
@@ -34,3 +34,5 @@ int pthread_once(pthread_once_t *control, void (*init)(void))
return 0;
}
}
+
+weak_alias(__pthread_once, pthread_once);
diff --git a/src/thread/pthread_setcancelstate.c b/src/thread/pthread_setcancelstate.c
index 060bcdc..2268217 100644
--- a/src/thread/pthread_setcancelstate.c
+++ b/src/thread/pthread_setcancelstate.c
@@ -1,6 +1,6 @@
#include "pthread_impl.h"
-int pthread_setcancelstate(int new, int *old)
+int __pthread_setcancelstate(int new, int *old)
{
if (new > 1U) return EINVAL;
if (!libc.has_thread_pointer) return ENOSYS;
@@ -9,3 +9,5 @@ int pthread_setcancelstate(int new, int *old)
self->canceldisable = new;
return 0;
}
+
+weak_alias(__pthread_setcancelstate, pthread_setcancelstate);
diff --git a/src/thread/pthread_testcancel.c b/src/thread/pthread_testcancel.c
index ba5f7c6..ee48e6d 100644
--- a/src/thread/pthread_testcancel.c
+++ b/src/thread/pthread_testcancel.c
@@ -7,7 +7,9 @@ static void dummy()
weak_alias(dummy, __testcancel);
-void pthread_testcancel()
+void __pthread_testcancel()
{
__testcancel();
}
+
+weak_alias(__pthread_testcancel, pthread_testcancel);
--
1.7.10.4
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