/*--------------------------------------------------------------- * Copyright (c) 1999,2000,2001,2002,2003 * The Board of Trustees of the University of Illinois * All Rights Reserved. *--------------------------------------------------------------- * Permission is hereby granted, free of charge, to any person * obtaining a copy of this software (Iperf) and associated * documentation files (the "Software"), to deal in the Software * without restriction, including without limitation the * rights to use, copy, modify, merge, publish, distribute, * sublicense, and/or sell copies of the Software, and to permit * persons to whom the Software is furnished to do * so, subject to the following conditions: * * * Redistributions of source code must retain the above * copyright notice, this list of conditions and * the following disclaimers. * * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimers in the documentation and/or other materials * provided with the distribution. * * * Neither the names of the University of Illinois, NCSA, * nor the names of its contributors may be used to endorse * or promote products derived from this Software without * specific prior written permission. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE CONTIBUTORS OR COPYRIGHT * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * ________________________________________________________________ * National Laboratory for Applied Network Research * National Center for Supercomputing Applications * University of Illinois at Urbana-Champaign * http://www.ncsa.uiuc.edu * ________________________________________________________________ * * Thread.c * by Kevin Gibbs <kgibbs@nlanr.net> * * Based on: * Thread.cpp * by Mark Gates <mgates@nlanr.net> * ------------------------------------------------------------------- * The thread subsystem is responsible for all thread functions. It * provides a thread implementation agnostic interface to Iperf. If * threads are not available (HAVE_THREAD is undefined), thread_start * does not start a new thread but just launches the specified object * in the current thread. Everything that defines a thread of * execution in Iperf is contained in an thread_Settings structure. To * start a thread simply pass one such structure into thread_start. * ------------------------------------------------------------------- * headers * uses * <stdlib.h> * <stdio.h> * <assert.h> * <errno.h> * Thread.h may include <pthread.h>
* ------------------------------------------------------------------- */
// number of currently running threads int thread_sNum = 0; // number of non-terminating running threads (ie listener thread) int nonterminating_num = 0; // condition to protect updating the above and alerting on // changes to above
Condition thread_sNum_cond;
/* ------------------------------------------------------------------- * Initialize the thread subsystems variables and set the concurrency * level in solaris.
* ------------------------------------------------------------------- */ void thread_init( ) {
Condition_Initialize( &thread_sNum_cond ); #ifdefined( sun ) /* Solaris apparently doesn't default to timeslicing threads, * as such we force it to play nice. This may not work perfectly * when _sending_ multiple _UDP_ streams.
*/
pthread_setconcurrency (3); #endif
}
// Win32 threads -- spawn new thread // Win32 has a thread handle in addition to the thread ID
thread->mHandle = CreateThread( NULL, 0, thread_run_wrapper, thread, 0, &thread->mTID ); if ( thread->mHandle == NULL ) {
WARN( 1, "CreateThread" );
// use exit() if called from within this thread // use cancel() if called from a different thread if ( thread_equalid( thread_getid(), thread->mTID ) ) {
// Cancel #ifdefined( HAVE_POSIX_THREAD ) // Cray J90 doesn't have pthread_cancel; Iperf works okay without #ifdef HAVE_PTHREAD_CANCEL
pthread_cancel( thread->mTID ); #endif #else// Win32 // this is a somewhat dangerous function; it's not // suggested to Stop() threads a lot.
TerminateThread( thread->mHandle, 0 ); #endif
// Destroy the object only after killing the thread
Settings_Destroy( thread );
}
} #endif
} // end Stop
/* ------------------------------------------------------------------- * This function is the entry point for new threads created in * thread_start.
* ------------------------------------------------------------------- */ #ifdefined( HAVE_WIN32_THREAD )
DWORD WINAPI #else void* #endif
thread_run_wrapper( void* paramPtr ) { struct thread_Settings* thread = (struct thread_Settings*) paramPtr;
// which type of object are we switch ( thread->mThreadMode ) { case kMode_Server:
{ /* Spawn a Server thread with these settings */
server_spawn( thread );
} break; case kMode_Client:
{ /* Spawn a Client thread with these settings */
client_spawn( thread );
} break; case kMode_Reporter:
{ /* Spawn a Reporter thread with these settings */
reporter_spawn( thread );
} break; case kMode_Listener:
{ // Increment the non-terminating thread count
thread_register_nonterm(); /* Spawn a Listener thread with these settings */
listener_spawn( thread ); // Decrement the non-terminating thread count
thread_unregister_nonterm();
} break; default:
{
FAIL(1, "Unknown Thread Type!\n", thread);
} break;
}
#ifdef HAVE_POSIX_THREAD // detach Thread. If someone already joined it will not do anything // If noone has then it will free resources upon return from this // function (Run_Wrapper)
pthread_detach(thread->mTID); #endif
// decrement thread count and send condition signal
Condition_Lock( thread_sNum_cond );
thread_sNum--;
Condition_Signal( &thread_sNum_cond );
Condition_Unlock( thread_sNum_cond );
// Check if we need to start up a thread after executing this one if ( thread->runNext != NULL ) {
thread_start( thread->runNext );
}
// Destroy this thread object
Settings_Destroy( thread );
return 0;
} // end run_wrapper
/* ------------------------------------------------------------------- * Wait for all thread object's execution to complete. Depends on the * thread count being accurate and the threads sending a condition * signal when they terminate.
* ------------------------------------------------------------------- */ void thread_joinall( void ) {
Condition_Lock( thread_sNum_cond ); while ( thread_sNum > 0 ) {
Condition_Wait( &thread_sNum_cond );
}
Condition_Unlock( thread_sNum_cond );
} // end Joinall
/* ------------------------------------------------------------------- * Compare the thread ID's (inLeft == inRight); return true if they * are equal. On some OS's nthread_t is a struct so == will not work. * TODO use pthread_equal. Any Win32 equivalent??
* ------------------------------------------------------------------- */ int thread_equalid( nthread_t inLeft, nthread_t inRight ) { return(memcmp( &inLeft, &inRight, sizeof(inLeft)) == 0);
}
/* ------------------------------------------------------------------- * Return a zero'd out thread ID. On some OS's nthread_t is a struct * so == 0 will not work. * [static]
* ------------------------------------------------------------------- */
nthread_t thread_zeroid( void ) {
nthread_t a;
memset( &a, 0, sizeof(a)); return a;
}
/* ------------------------------------------------------------------- * set a thread to be ignorable, so joinall won't wait on it * this simply decrements the thread count that joinall uses. * This is utilized by the reporter thread which knows when it * is ok to quit (aka no pending reports).
* ------------------------------------------------------------------- */ void thread_setignore( ) {
Condition_Lock( thread_sNum_cond );
thread_sNum--;
Condition_Signal( &thread_sNum_cond );
Condition_Unlock( thread_sNum_cond );
}
/* ------------------------------------------------------------------- * unset a thread from being ignorable, so joinall will wait on it * this simply increments the thread count that joinall uses. * This is utilized by the reporter thread which knows when it * is ok to quit (aka no pending reports).
* ------------------------------------------------------------------- */ void thread_unsetignore( void ) {
Condition_Lock( thread_sNum_cond );
thread_sNum++;
Condition_Signal( &thread_sNum_cond );
Condition_Unlock( thread_sNum_cond );
}
/* ------------------------------------------------------------------- * set a thread to be non-terminating, so if you cancel through * Ctrl-C they can be ignored by the joinall.
* ------------------------------------------------------------------- */ void thread_register_nonterm( void ) {
Condition_Lock( thread_sNum_cond );
nonterminating_num++;
Condition_Unlock( thread_sNum_cond );
}
/* ------------------------------------------------------------------- * unset a thread from being non-terminating, so if you cancel through * Ctrl-C they can be ignored by the joinall.
* ------------------------------------------------------------------- */ void thread_unregister_nonterm( void ) {
Condition_Lock( thread_sNum_cond ); if ( nonterminating_num == 0 ) { // nonterminating has been released with release_nonterm // Add back to the threads to wait on
thread_sNum++;
} else {
nonterminating_num--;
}
Condition_Unlock( thread_sNum_cond );
}
/* ------------------------------------------------------------------- * this function releases all non-terminating threads from the list * of active threads, so that when all terminating threads quit * the joinall will complete. This is called on a Ctrl-C input. It is * also used by the -P usage on the server side
* ------------------------------------------------------------------- */ int thread_release_nonterm( int interrupt ) {
Condition_Lock( thread_sNum_cond );
thread_sNum -= nonterminating_num; if ( thread_sNum > 1 && nonterminating_num > 0 && interrupt != 0 ) {
fprintf( stderr, wait_server_threads );
}
nonterminating_num = 0;
Condition_Signal( &thread_sNum_cond );
Condition_Unlock( thread_sNum_cond ); return thread_sNum;
}
/* ------------------------------------------------------------------- * Return the number of threads currently running (doesn't include * active threads that have called setdaemon (aka reporter thread))
* ------------------------------------------------------------------- */ int thread_numuserthreads( void ) { return thread_sNum;
}
/* * ------------------------------------------------------------------- * Allow another thread to execute. If no other threads are runable this * is not guarenteed to actually rest.
* ------------------------------------------------------------------- */ void thread_rest ( void ) { #ifdefined( HAVE_THREAD ) #ifdefined( HAVE_POSIX_THREAD ) #else// Win32
SwitchToThread( ); #endif #endif
}
#ifdef __cplusplus
} /* end extern "C" */ #endif
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