lib/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2025-07-29 11:41:21 +03:00
Code Activity

New API to set default thread attributes

Browse Source 
This patch introduces two new convenience functions to set the default
thread attributes used for creating threads.  This allows a programmer
to set the default thread attributes just once in a process and then
run pthread_create without additional attributes.
This commit is contained in:
Siddhesh Poyarekar
2013-06-15 12:24:15 +05:30
parent 601eb33deb
commit 61dd6208fb
49 changed files with 817 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

51
nptl/pthread_create.c
View File

@ -449,18 +449,47 @@ __pthread_create_2_1 (newthread, attr, start_routine, arg)
STACK_VARIABLES;
const struct pthread_attr *iattr = (struct pthread_attr *) attr;
struct pthread_attr default_attr;
bool free_cpuset = false;
if (iattr == NULL)
/* Is this the best idea? On NUMA machines this could mean
accessing far-away memory. */
iattr = &__default_pthread_attr;
{
lll_lock (__default_pthread_attr_lock, LLL_PRIVATE);
default_attr = __default_pthread_attr;
size_t cpusetsize = default_attr.cpusetsize;
if (cpusetsize > 0)
{
cpu_set_t *cpuset;
if (__glibc_likely (__libc_use_alloca (cpusetsize)))
cpuset = __alloca (cpusetsize);
else
{
cpuset = malloc (cpusetsize);
if (cpuset == NULL)
{
lll_unlock (__default_pthread_attr_lock, LLL_PRIVATE);
return ENOMEM;
}
free_cpuset = true;
}
memcpy (cpuset, default_attr.cpuset, cpusetsize);
default_attr.cpuset = cpuset;
}
lll_unlock (__default_pthread_attr_lock, LLL_PRIVATE);
iattr = &default_attr;
}
struct pthread *pd = NULL;
int err = ALLOCATE_STACK (iattr, &pd);
int retval = 0;
if (__builtin_expect (err != 0, 0))
/* Something went wrong. Maybe a parameter of the attributes is
invalid or we could not allocate memory. Note we have to
translate error codes. */
return err == ENOMEM ? EAGAIN : err;
{
retval = err == ENOMEM ? EAGAIN : err;
goto out;
}
/* Initialize the TCB. All initializations with zero should be
@ -511,8 +540,7 @@ __pthread_create_2_1 (newthread, attr, start_routine, arg)
#endif
/* Determine scheduling parameters for the thread. */
if (attr != NULL
&& __builtin_expect ((iattr->flags & ATTR_FLAG_NOTINHERITSCHED) != 0, 0)
if (__builtin_expect ((iattr->flags & ATTR_FLAG_NOTINHERITSCHED) != 0, 0)
&& (iattr->flags & (ATTR_FLAG_SCHED_SET | ATTR_FLAG_POLICY_SET)) != 0)
{
INTERNAL_SYSCALL_DECL (scerr);
@ -551,7 +579,8 @@ __pthread_create_2_1 (newthread, attr, start_routine, arg)
__deallocate_stack (pd);
return EINVAL;
retval = EINVAL;
goto out;
}
}
@ -561,7 +590,13 @@ __pthread_create_2_1 (newthread, attr, start_routine, arg)
LIBC_PROBE (pthread_create, 4, newthread, attr, start_routine, arg);
/* Start the thread. */
return create_thread (pd, iattr, STACK_VARIABLES_ARGS);
retval = create_thread (pd, iattr, STACK_VARIABLES_ARGS);
out:
if (__glibc_unlikely (free_cpuset))
free (default_attr.cpuset);
return retval;
}
versioned_symbol (libpthread, __pthread_create_2_1, pthread_create, GLIBC_2_1);