From 4301f7e2f036f11dffec92c37a41dbf05fc8a71d Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Mon, 3 Feb 2003 06:11:58 +0000 Subject: Update. * allocatestack.c: Improve comment throughout the file. --- nptl/allocatestack.c | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-) (limited to 'nptl/allocatestack.c') diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c index eabc68517a..4e9826beb5 100644 --- a/nptl/allocatestack.c +++ b/nptl/allocatestack.c @@ -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 , 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. */ -- cgit 1.4.1