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/*
* SCPAR.C - parallel support routines
*
* Source Version: 2.0
* Software Release #92-0043
*
*/
#include "cpyright.h"
#include "score.h"
SC_THREAD_ATTR(_SC_thread_attr);
static int
*_SC_indexes = NULL;
static SC_thread
*_SC_threads = NULL;
static SC_thread_key
*SC_key;
#ifdef HAVE_THREADS
static void
SC_DECLARE(_SC_work_thread, (void *x));
static int
SC_thread_work_size,
SC_n_threads,
SC_next_work_item,
SC_n_work_started,
SC_n_work_finished,
SC_n_work_items;
SC_dynamic_array
SC_thread_args,
SC_thread_work;
static void
**SC_thread_ret;
#endif
int
SC_comm_rank = 0,
SC_comm_size = 1;
SC_THREAD_CONDV(SC_work_available_condv);
SC_THREAD_CONDV(SC_work_finished_condv);
SC_THREAD_LOCK(SC_thread_workqueue_lock);
/*--------------------------------------------------------------------------*/
/* SMP ROUTINES */
/*--------------------------------------------------------------------------*/
/* SC_CURRENT_THREAD - return the id of the current thread */
int SC_current_thread()
{int tid;
if (SC_tid_hook != NULL)
(*SC_tid_hook)(&tid);
else
tid = 0;
return(tid);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* SC_INIT_THREADS - execute the given function FNC on NT threads
* - serial execution follows from NT equal to 1
*/
void SC_init_threads(nt, ik, tid)
int nt;
SC_thread_key *ik;
PFVoid tid;
{
#ifdef HAVE_THREADS
int i;
#endif
_SC_threads = FMAKE_N(SC_thread, nt+1, "SC_INIT_THREADS:threads");
_SC_indexes = FMAKE_N(int, nt+1, "SC_INIT_THREADS:indexes");
_SC_indexes[0] = 0;
_SC_threads[0] = SC_THREAD_SELF();
SC_CREATE_KEY(*ik, NULL);
SC_SET_KEY(int, *ik, _SC_indexes);
SC_key = ik;
SC_tid_hook = tid;
#ifdef HAVE_THREADS
SC_thread_work_size = nt;
SC_n_threads = nt;
SC_n_work_started = nt;
SC_n_work_finished = 0;
SC_n_work_items = 0;
SC_INIT_DYNAMIC_ARRAY(SC_thread_work, PFPVoid, "PFPVoid", SC_thread_work_size);
SC_INIT_DYNAMIC_ARRAY(SC_thread_args, void *, "void *", SC_thread_work_size);
for (i = 1; i <= nt; i++)
{_SC_indexes[i] = i;
SC_THREAD_CREATE(_SC_threads[i], _SC_thread_attr,
_SC_work_thread, _SC_indexes[i]);};
/* wait until all threads are initialized before returning */
SC_LOCKON(SC_thread_workqueue_lock);
while (SC_n_work_finished < SC_n_work_started)
SC_COND_WAIT(SC_work_finished_condv, SC_thread_workqueue_lock);
SC_LOCKOFF(SC_thread_workqueue_lock);
#endif
return;}
/*--------------------------------------------------------------------------*/
#ifdef HAVE_THREADS
/*--------------------------------------------------------------------------*/
/* SC_DO_THREADS - execute the given function NT times
* - serial execution follows from NT equal to 1
*
* n: number of entries in the following arguments
* nt[i]: number of threads that should execute fnc[i]
* fnc: array of functions to execute
* arg[i]: argument list (struct *) for fnc[i]
* ik: thread key
* ret: array to hold return values from fnc, there
* needs to be enough space to handle all the
* function invocations (independent of number
* of threads).
*/
void SC_do_threads(n, nt, fnc, arg, ik, ret)
int n, *nt;
void *(*fnc[])();
void **arg;
SC_thread_key *ik;
void **ret;
{int i, j;
SC_LOCKON(SC_thread_workqueue_lock);
SC_thread_ret = ret;
SC_N_DYNAMIC(SC_thread_work) = 0;
SC_N_DYNAMIC(SC_thread_args) = 0;
SC_n_work_finished = 0;
SC_n_work_started = 0;
SC_n_work_items = 0;
for (i = 0; i < n; i++)
for (j = 0; j < nt[i]; j++)
{SC_REMEMBER_DYNAMIC(PFPVoid, fnc[i], SC_thread_work);
if (arg != NULL)
{SC_REMEMBER_DYNAMIC(void *, arg[i], SC_thread_args);}
else
{SC_REMEMBER_DYNAMIC(void *, NULL, SC_thread_args);}
SC_n_work_items++;};
SC_next_work_item = 0;
SC_THREAD_BROADCAST(SC_work_available_condv);
while(SC_n_work_finished < SC_n_work_items)
SC_COND_WAIT(SC_work_finished_condv, SC_thread_workqueue_lock);
SC_LOCKOFF(SC_thread_workqueue_lock);
return;}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
void _SC_work_thread(x)
void *x;
{PFPVoid fnc;
void *arg;
int i, t;
t = *(int *)x;
SC_SET_KEY(int, *SC_key, x);
while (TRUE)
{SC_LOCKON(SC_thread_workqueue_lock);
SC_n_work_finished++;
if (SC_n_work_started >= SC_n_work_items)
SC_n_work_items = 0;
if (SC_n_work_started == SC_n_work_finished &&
SC_n_work_items == 0)
SC_THREAD_SIGNAL(SC_work_finished_condv);
while(SC_n_work_items == 0)
SC_COND_WAIT(SC_work_available_condv, SC_thread_workqueue_lock);
if (SC_n_work_started < SC_n_work_items)
{fnc = SC_GET_NTH_DYNAMIC(PFPVoid, SC_thread_work, SC_next_work_item);
arg = SC_GET_NTH_DYNAMIC(void *, SC_thread_args, SC_next_work_item);
i = SC_next_work_item;
SC_next_work_item++;}
else
fnc = NULL;
SC_n_work_started++;
SC_LOCKOFF(SC_thread_workqueue_lock);
if (fnc != NULL)
if (SC_thread_ret == NULL)
(*fnc) (arg);
else
SC_thread_ret[i+1] = (*fnc)(arg);}
return;}
/*--------------------------------------------------------------------------*/
#else
/*--------------------------------------------------------------------------*/
/* SC_DO_THREADS - execute the given function FNC on NT threads
* - serial execution follows from NT equal to 1
*/
void SC_do_threads(n, nt, fnc, arg, ik, ret)
int n, *nt;
void *(*fnc[])();
void **arg;
SC_thread_key *ik;
void **ret;
{int i, j, icounter;
void *larg;
PFPVoid lfnc;
if (ret == NULL)
{for (i = 0; i < n; i++)
for (j = 1; j <= nt[i]; j++)
{_SC_indexes[j] = j;
SC_SET_KEY(int, *ik, &j);
larg = (arg == NULL) ? NULL : arg[i];
lfnc = fnc[i];
(*lfnc)((void *) larg);};}
else
{icounter = 0;
for (i = 0; i < n; i++)
for (j = 1; j <= nt[i]; j++)
{_SC_indexes[j] = j;
SC_SET_KEY(int, *ik, &j);
larg = (arg == NULL) ? NULL : arg[i];
lfnc = fnc[i];
ret[++icounter] = (*lfnc)((void *) larg);};};
i = 0;
SC_SET_KEY(int, *ik, &i);
return;}
/*--------------------------------------------------------------------------*/
#endif
/*--------------------------------------------------------------------------*/
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