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/*
* Program to print default pthread attributes
*/
/*
* Copyright 2018 Joel Sherrill (joel@rtems.org)
*
* This file's license is 2-clause BSD as in this distribution's LICENSE.2 file.
*/
#include <stdlib.h>
#include <stdio.h>
#include <inttypes.h>
#include <pthread.h>
#include <assert.h>
static void print_stack_info(pthread_attr_t *attr)
{
int rc;
void *addr;
size_t size;
/*
* pthread_attr_getstacksize() and pthread_attr_[sg]etstackaddr() are
* obsolete.
*/
rc = pthread_attr_getstack( attr, &addr, &size );
assert( rc == 0 );
printf( "Stack size: %zu\n", size );
printf( "Stack address: %p\n", addr );
rc = pthread_attr_getguardsize( attr, &size );
assert( rc == 0 );
printf( "Stack guard size: %zu\n", size );
}
static void print_inherit_scheduler(pthread_attr_t *attr)
{
int rc;
int sched;
char *s;
rc = pthread_attr_getinheritsched( attr, &sched );
assert( rc == 0 );
switch( sched ) {
case PTHREAD_INHERIT_SCHED: s = "PTHREAD_INHERIT_SCHED"; break;
case PTHREAD_EXPLICIT_SCHED: s = "PTHREAD_EXPLICIT_SCHED"; break;
default: s = "UNKNOWN"; break;
}
printf( "Inherit scheduler: %s\n", s );
}
static void print_scope(pthread_attr_t *attr)
{
int rc;
int scope;
char *s;
rc = pthread_attr_getscope( attr, &scope );
assert( rc == 0 );
switch( scope ) {
case PTHREAD_SCOPE_SYSTEM: s = "PTHREAD_SCOPE_SYSTEM"; break;
case PTHREAD_SCOPE_PROCESS: s = "PTHREAD_SCOPE_PROCESS"; break;
default: s = "UNKNOWN"; break;
}
printf( "Thread scope: %s\n", s );
}
static void print_detach_state(pthread_attr_t *attr)
{
int rc;
int state;
char *s;
rc = pthread_attr_getdetachstate( attr, &state );
assert( rc == 0 );
switch( state ) {
case PTHREAD_CREATE_JOINABLE: s = "PTHREAD_CREATE_JOINABLE"; break;
case PTHREAD_CREATE_DETACHED: s = "PTHREAD_CREATE_DETACHED"; break;
default: s = "UNKNOWN"; break;
}
printf( "Thread detach state: %s\n", s );
}
static void print_sched_info(pthread_attr_t *attr)
{
int rc;
int policy;
char *s;
struct sched_param sched;
rc = pthread_attr_getschedpolicy( attr, &policy );
assert( rc == 0 );
rc = pthread_attr_getschedparam( attr, &sched );
assert( rc == 0 );
switch( policy ) {
case SCHED_OTHER: s = "SCHED_OTHER"; break;
case SCHED_FIFO: s = "SCHED_FIFO"; break;
case SCHED_RR: s = "SCHED_RR"; break;
#if defined(SCHED_SPORADIC)
case SCHED_SPORADIC: s = "SCHED_SPORADIC"; break;
#endif
default: s = "UNKNOWN"; break;
}
printf( "Scheduler policy : %s\n", s );
printf( "Scheduler priority : %d\n", sched.sched_priority );
#if defined(SCHED_SPORADIC)
if ( policy == SCHED_SPORADIC ) {
printf(
"Sporadic low priority : %d\n"
"Sporadic period: %lld:%ld\n"
"Sporadic initial budget: %lld:%ld\n"
"Sporadic max pending replenishments: %d\n",
sched.sched_ss_low_priority,
(long long) sched.sched_ss_repl_period.tv_sec,
sched.sched_ss_repl_period.tv_nsec,
(long long) sched.sched_ss_init_budget.tv_sec,
sched.sched_ss_init_budget.tv_nsec,
sched.sched_ss_max_repl
);
}
#endif
}
int main()
{
pthread_attr_t attr;
int rc;
puts( "*** POSIX Thread Default Attributes Report ***" );
rc = pthread_attr_init( &attr );
assert( rc == 0 );
print_stack_info( &attr );
print_inherit_scheduler( &attr );
print_scope( &attr );
print_detach_state( &attr );
print_sched_info( &attr );
puts( "*** END OF POSIX Thread Default Attributes Report ***" );
exit( 0 );
}
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