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* allocatestack.c: Improve comment throughout the file.
This commit is contained in:
Ulrich Drepper 2003-02-03 06:11:58 +00:00
parent 2f42e8be4c
commit 4301f7e2f0
2 changed files with 18 additions and 9 deletions
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2
nptl/ChangeLog
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@ -1,5 +1,7 @@
2003-02-02 Ulrich Drepper <drepper@redhat.com>
* allocatestack.c: Improve comment throughout the file.
* sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S
(__lll_lock_wait): Add branch predicition.
* sysdeps/unix/sysv/linux/i386/i486/libc-lowlevellock.S

25
nptl/allocatestack.c
View File

@ -1,4 +1,4 @@
/* Copyright (C) 2002 Free Software Foundation, Inc.
/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -170,7 +170,7 @@ get_cached_stack (size_t *sizep, void **memp)
/* Add a stack frame which is not used anymore to the stack. Must be
called with the cache lock held. */
static void
static inline void
queue_stack (struct pthread *stack)
{
/* We unconditionally add the stack to the list. The memory may
@ -256,24 +256,26 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
pd = (struct pthread *) (((uintptr_t) attr->stackaddr - adj)
& ~(__alignof (struct pthread) - 1)) - 1;
/* The user provided stack memory need not be cleared. */
/* The user provided stack memory needs to be cleared. */
memset (pd, '\0', sizeof (struct pthread));
/* The first TSD block is included in the TCB. */
pd->specific[0] = pd->specific_1stblock;
#if LLL_LOCK_INITIALIZER != 0
/* Initialize the lock. */
pd->lock = LLL_LOCK_INITIALIZER;
#endif
/* Remember the stack-related values. Signal that this stack
must not be put into the stack cache. */
/* Remember the stack-related values. */
pd->stackblock = (char *) attr->stackaddr - size;
pd->stackblock_size = size - adj;
/* This is a user-provided stack. */
/* This is a user-provided stack. It will not be queued in the
stack cache nor will the memory (except the TLS memory) be freed. */
pd->user_stack = true;
/* There is at least one more thread. */
/* This is at least the second thread. */
pd->header.data.multiple_threads = 1;
#ifdef NEED_DL_SYSINFO
@ -288,6 +290,7 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
return errno;
/* Prepare to modify global data. */
lll_lock (stack_cache_lock);
/* And add to the list of stacks in use. */
@ -318,6 +321,7 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
/* The stack is too small (or the guard too large). */
return EINVAL;
/* Try to get a stack from the cache. */
reqsize = size;
pd = get_cached_stack (&size, &mem);
if (pd == NULL)
@ -344,10 +348,12 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
descriptor. */
pd->specific[0] = pd->specific_1stblock;
#if LLL_LOCK_INITIALIZER != 0
/* Initialize the lock. */
pd->lock = LLL_LOCK_INITIALIZER;
#endif
/* There is at least one more thread. */
/* This is at least the second thread. */
pd->header.data.multiple_threads = 1;
#ifdef NEED_DL_SYSINFO
@ -363,12 +369,13 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
int err = errno;
/* Free the stack memory we just allocated. */
munmap (mem, size);
(void) munmap (mem, size);
return err;
}
/* Prepare to modify global data. */
lll_lock (stack_cache_lock);
/* And add to the list of stacks in use. */