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default thread attributes: default value for inheritsched changed from

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explicit to inherit scheduler to be consistent with FSU pthreads for gnat.

_POSIX_Threads_Create_extension: now inherit signal blocked mask from
creator if the new thread is a posix thread.

_POSIX_Threads_Initialize_user_threads: make sure posix initialization
threads start with a useful priority.  If they inherit the priority
of the creating thread, they will end up at the same priority as the
idle thread.  Since the idle thread does not yield, they will not run.
This commit is contained in:
Joel Sherrill
1996-09-05 20:45:05 +00:00
parent 297be5c8f1
commit 65c421ffc5
2 changed files with 50 additions and 10 deletions
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30
c/src/exec/posix/src/pthread.c
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@@ -24,6 +24,10 @@
/*PAGE
*
* The default pthreads attributes structure.
*
* NOTE: Be careful .. if the default attribute set changes,
* _POSIX_Threads_Initialize_user_threads will need to be examined.
*
*/
const pthread_attr_t _POSIX_Threads_Default_attributes = {
@@ -31,7 +35,7 @@ const pthread_attr_t _POSIX_Threads_Default_attributes = {
NULL, /* stackaddr */
PTHREAD_MINIMUM_STACK_SIZE, /* stacksize */
PTHREAD_SCOPE_PROCESS, /* contentionscope */
PTHREAD_EXPLICIT_SCHED, /* inheritsched */
PTHREAD_INHERIT_SCHED, /* inheritsched */
SCHED_FIFO, /* schedpolicy */
{ /* schedparam */
2, /* sched_priority */
@@ -127,6 +131,7 @@ boolean _POSIX_Threads_Create_extension(
)
{
POSIX_API_Control *api;
POSIX_API_Control *executing_api;
api = _Workspace_Allocate( sizeof( POSIX_API_Control ) );
@@ -150,9 +155,10 @@ boolean _POSIX_Threads_Create_extension(
/* XXX use signal constants */
api->signals_pending = 0;
if ( _Objects_Get_class( created->Object.id ) == OBJECTS_POSIX_THREADS )
api->signals_blocked = 0;
else
if ( _Objects_Get_class( created->Object.id ) == OBJECTS_POSIX_THREADS ) {
executing_api = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ];
api->signals_blocked = api->signals_blocked;
} else
api->signals_blocked = 0xffffffff;
/* XXX set signal parameters -- block all signals for non-posix threads */
@@ -232,6 +238,7 @@ void _POSIX_Threads_Initialize_user_threads( void )
unsigned32 maximum;
posix_initialization_threads_table *user_threads;
pthread_t thread_id;
pthread_attr_t attr;
user_threads = _POSIX_Threads_User_initialization_threads;
maximum = _POSIX_Threads_Number_of_initialization_threads;
@@ -239,10 +246,23 @@ void _POSIX_Threads_Initialize_user_threads( void )
if ( !user_threads || maximum == 0 )
return;
/*
* Be careful .. if the default attribute set changes, this may need to.
*
* Setting the attributes explicitly is critical, since we don't want
* to inherit the idle tasks attributes.
*/
for ( index=0 ; index < maximum ; index++ ) {
status = pthread_attr_init( &attr );
assert( !status );
status = pthread_attr_setinheritsched( &attr, PTHREAD_EXPLICIT_SCHED );
assert( !status );
status = pthread_create(
&thread_id,
NULL,
&attr,
user_threads[ index ].entry,
NULL
);