source: src/tests/concurrent/signal/disjoint.c @ 1485c1a

#include <fstream>
#include <kernel>
#include <monitor>
#include <thread>

#include <time.h>

static const unsigned long N = 10_000ul;

#ifndef PREEMPTION_RATE
#define PREEMPTION_RATE 10_000ul
#endif

unsigned int default_preemption() {
        return PREEMPTION_RATE;
}

enum state_t { WAIT, SIGNAL, BARGE };

monitor global_t {};
global_t mut;

monitor global_data_t;
void ?{}( global_data_t & this );
void ^?{} ( global_data_t & this );

monitor global_data_t {
        int counter;
        state_t state;
} data;

condition cond;

volatile bool all_done;

void ?{}( global_data_t & this ) {
        this.counter == 0;
        this.state = BARGE;
}

void ^?{} ( global_data_t & this ) {}

//------------------------------------------------------------------------------
// Barging logic
void barge( global_data_t & mutex d ) {
        d.state = BARGE;
}

thread Barger {};

void main( Barger & this ) {
        while( !all_done ) {
                barge( data );
                yield();
        }
}

//------------------------------------------------------------------------------
// Waiting logic
bool wait( global_t & mutex m, global_data_t & mutex d ) {
        wait( cond );
        if( d.state != SIGNAL ) {
                sout | "ERROR barging!" | endl;
        }

        d.counter++;

        if( (d.counter % 1000) == 0 ) sout | d.counter | endl;

        return d.counter < N;
}

thread Waiter {};

void main( Waiter & this ) {
        while( wait( mut, data ) ) { yield(); }
}


//------------------------------------------------------------------------------
// Signalling logic
void signal( condition & cond, global_t & mutex a, global_data_t & mutex b ) {
        b.state = SIGNAL;
        signal( cond );
}

void logic( global_t & mutex a ) {
        signal( cond, a, data );

        yield( random( 10 ) );

        //This is technically a mutual exclusion violation but the mutex monitor protects us
        bool running = data.counter < N && data.counter > 0;
        if( data.state != SIGNAL && running ) {
                sout | "ERROR Eager signal" | data.state | endl;
        }
}

thread Signaller {};

void main( Signaller & this ) {
        while( !all_done ) {
                logic( mut );
                yield();
        }
}

//------------------------------------------------------------------------------
// Main loop
int main(int argc, char* argv[]) {
        random_seed( time( NULL ) );
        all_done = false;
        processor p;
        {
                Signaller s;
                Barger b[17];
                {
                        Waiter w[4];
                }
                sout | "All waiter done" | endl;
                all_done = true;
        }
}