source: libcfa/src/concurrency/cofor.hfa @ 1ed5e9e

#include <thread.hfa>

//////////////////////////////////////////////////////////////////////////////////////////
// cofor ( uC++ COFOR )
typedef void (*cofor_body_t)( long );
thread co_runner {
    long lo, hi;
    cofor_body_t loop_body;
};

void ?{}( co_runner & this, long lo, long hi, cofor_body_t loop_body ) {
    this.lo = lo;
    this.hi = hi;
    this.loop_body = loop_body;
}

void main( co_runner & this ) with( this ) {
    for ( long i = lo; i < hi; i++ )
        loop_body(i);
}

void cofor( long lo, long hi, cofor_body_t loop_body ) {
    long range = hi - lo;
    if ( range <= 0 ) return;
    long nprocs = get_proc_count( *active_cluster() );
    if ( nprocs == 0 ) return;
    long threads = range < nprocs ? range : nprocs;
    long stride = range / threads + 1, extras = range % threads;
    long i = 0;
    long stride_iter = lo;
    co_runner * runners[ threads ];
    for ( i; threads ) {
        runners[i] = alloc();
    }
    for ( i = 0; i < extras; i += 1, stride_iter += stride ) {
        (*runners[i]){ stride_iter, stride_iter + stride, loop_body };
    }
    stride -= 1;
    for ( ; i < threads; i += 1, stride_iter += stride ) {
        (*runners[i]){ stride_iter, stride_iter + stride, loop_body };
    }
    for ( i; threads ) {
        delete( runners[i] );
    }
}

//////////////////////////////////////////////////////////////////////////////////////////
// parallel (COBEGIN/COEND)
typedef void (*parallel_stmt_t)( void * );
thread para_runner {
    parallel_stmt_t body;
    void * arg;
};

void ?{}( para_runner & this, parallel_stmt_t body, void * arg ) { 
    this.body = body;
    this.arg = arg;
}

void main( para_runner & this ) with( this ) { body( arg ); }

void parallel( parallel_stmt_t * stmts, void ** args, size_t num ) {
    para_runner * runners[ num ];
    for ( i; num )
        (*(runners[i] = malloc())){ stmts[i], args[i] };
    for ( i; num )
        delete( runners[i] );
}