source: src/tests/sched-int-barge.c@ 4cc9b13

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

static const unsigned long N = 50_000ul;

#ifndef PREEMPTION_RATE
#define PREEMPTION_RATE 10_000ul
#endif

unsigned int default_preemption() {
        return 0;
}
enum state_t { WAIT, SIGNAL, BARGE };

monitor global_t {};

monitor global_data_t {
        volatile bool done;
        int counter;
        state_t state;

        unsigned short do_signal;
        unsigned short do_wait2;
        unsigned short do_wait1;
};

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

        this.do_signal = 6;
        this.do_wait1  = 1;
        this.do_wait2  = 3;
}

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

global_t globalA;
global_t globalB;
global_data_t globalC;

condition cond;

thread Threads {};

bool logicC( global_t & mutex a, global_t & mutex b, global_data_t & mutex c ) {
        c.counter++;

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

        int action = c.counter % 10;

        if( action == 0 ) {
                c.do_signal = max( ((unsigned)rand48()) % 10, 1);
                c.do_wait1 = ((unsigned)rand48()) % (c.do_signal);
                c.do_wait2 = ((unsigned)rand48()) % (c.do_signal);

                if(c.do_wait1 == c.do_wait2) sout | "Same" | endl;
        }

        if( action == c.do_wait1 || action == c.do_wait2 ) {
                c.state = WAIT;
                wait( &cond );

                if(c.state != SIGNAL) {
                        sout | "ERROR Barging detected" | c.counter | endl;
                        abort();
                }
        }
        else if( action == c.do_signal ) {
                c.state = SIGNAL;

                signal( &cond );
                signal( &cond );
        }
        else {
                c.state = BARGE;
        }

        if( c.counter >= N ) c.done = true;
        return !c.done;
}

bool logicB( global_t & mutex a, global_t & mutex b ) {
        return logicC(a, b, globalC);
}

bool logicA( global_t & mutex a ) {
        return logicB(a, globalB);
}

void main( Threads & this ) {
        while( logicA(globalA) ) { yield(); };
}

static thread_desc * volatile the_threads;

int main(int argc, char* argv[]) {
        rand48seed(0);
        processor p;
        {
                Threads t[17];
                the_threads = (thread_desc*)t;
        }
}