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| author | Ulrich Drepper <drepper@redhat.com> | 2000-12-31 07:39:50 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2000-12-31 07:39:50 +0000 |
| commit | 09f5e1635ae75de077c5307d02fdbefc4b0c7144 (patch) | |
| tree | b328e9ca3e582fd022a6832277f764b20f0586cf /linuxthreads | |
| parent | c77a447822c8ccc6866216bad737189fff3a0b93 (diff) | |
| download | glibc-09f5e1635ae75de077c5307d02fdbefc4b0c7144.tar.gz glibc-09f5e1635ae75de077c5307d02fdbefc4b0c7144.tar.xz glibc-09f5e1635ae75de077c5307d02fdbefc4b0c7144.zip | |
Update.
2000-12-28 Wolfram Gloger <wg@malloc.de> * malloc/malloc.c (MALLOC_COPY): Handle case if source and destination overlap. Assume dest is always below source if overlapping.
Diffstat (limited to 'linuxthreads')
| -rw-r--r-- | linuxthreads/ChangeLog | 5 | ||||
| -rw-r--r-- | linuxthreads/manager.c | 31 |
2 files changed, 21 insertions, 15 deletions
diff --git a/linuxthreads/ChangeLog b/linuxthreads/ChangeLog index 176099431b..2bb9371912 100644 --- a/linuxthreads/ChangeLog +++ b/linuxthreads/ChangeLog @@ -1,3 +1,8 @@ +2000-11-15 Wolfram Gloger <wg@malloc.de> + + * manager.c (pthread_free): [!FLOATING_STACKS]: Only remap the + stack to PROT_NONE, don't unmap it, avoiding collisions with malloc. + 2000-12-27 Andreas Jaeger <aj@suse.de> * Examples/ex13.c: Make local functions static. diff --git a/linuxthreads/manager.c b/linuxthreads/manager.c index 37f426759f..8442629c08 100644 --- a/linuxthreads/manager.c +++ b/linuxthreads/manager.c @@ -418,7 +418,7 @@ static int pthread_allocate_stack(const pthread_attr_t *attr, new_thread_bottom = (char *) map_addr + guardsize; new_thread = ((pthread_descr) (new_thread_bottom + stacksize)) - 1; -# else +# else /* !FLOATING_STACKS */ if (attr != NULL) { guardsize = page_roundup (attr->__guardsize, granularity); @@ -696,23 +696,24 @@ static void pthread_free(pthread_descr th) { size_t guardsize = th->p_guardsize; /* Free the stack and thread descriptor area */ -#ifdef NEED_SEPARATE_REGISTER_STACK char *guardaddr = th->p_guardaddr; - /* We unmap exactly what we mapped, in case there was something - else in the same region. Guardaddr is always set, eve if - guardsize is 0. This allows us to compute everything else. */ + /* Guardaddr is always set, even if guardsize is 0. This allows + us to compute everything else. */ size_t stacksize = (char *)(th+1) - guardaddr - guardsize; - /* Unmap the register stack, which is below guardaddr. */ - munmap((caddr_t)(guardaddr-stacksize), - 2 * stacksize + th->p_guardsize); +#ifdef NEED_SEPARATE_REGISTER_STACK + /* Take account of the register stack, which is below guardaddr. */ + guardaddr -= stacksize; + stacksize *= 2; +#endif +#if FLOATING_STACKS + /* Can unmap safely. */ + munmap(guardaddr, stacksize + guardsize); #else - char *guardaddr = th->p_guardaddr; - /* We unmap exactly what we mapped, in case there was something - else in the same region. Guardaddr is always set, eve if - guardsize is 0. This allows us to compute everything else. */ - size_t stacksize = (char *)(th+1) - guardaddr - guardsize; - - munmap (guardaddr, stacksize + guardsize); + /* Only remap to PROT_NONE, so that the region is reserved in + case we map the stack again later. Avoid collision with + other mmap()s, in particular by malloc(). */ + mmap(guardaddr, stacksize + guardsize, PROT_NONE, + MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0); #endif } } |