source: tests/concurrency/waitfor/when.cfa @ fa5e1aa5

//----------------------------------------------------------------
// When test
// Ensures that when clauses on waitfor are respected
//-----------------------------------------------------------------

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

#include <stdbool.h>
#include <time.h>

static const unsigned long N = 4_998ul;

static inline void rand_yield() { yield(random( 10 )); }

monitor global_t {
        int last_call;
        bool done;
};

void ?{} ( global_t & this ) {
        this.last_call = 6;
        this.done = false;
}

void ^?{} ( global_t & mutex this ) {}

global_t global;

bool call1( global_t & mutex this ) { this.last_call = 1; return this.done; }
bool call2( global_t & mutex this ) { this.last_call = 2; return this.done; }
bool call3( global_t & mutex this ) { this.last_call = 3; return this.done; }
bool call4( global_t & mutex this ) { this.last_call = 4; return this.done; }
bool call5( global_t & mutex this ) { this.last_call = 5; return this.done; }
bool call6( global_t & mutex this ) { this.last_call = 6; return this.done; }

thread caller_t{};
void main( caller_t & this ) {
        while( true ) {
                rand_yield();
                if( call1( global ) ) return;
                rand_yield();
                if( call2( global ) ) return;
                rand_yield();
                if( call3( global ) ) return;
                rand_yield();
                if( call4( global ) ) return;
                rand_yield();
                if( call5( global ) ) return;
                rand_yield();
                if( call6( global ) ) return;
        }
}

void arbiter( global_t & mutex this ) {
        // There is a race at start where callers can get in before the arbiter.
        // It doesn't really matter here so just restart the loop correctly and move on
        this.last_call = 6;

        for( int i = 0; i < N; i++ ) {
                   when( this.last_call == 6 ) waitfor( call1 : this ) { if( this.last_call != 1) { serr | "Expected last_call to be 1 got" | this.last_call; } }
                or when( this.last_call == 1 ) waitfor( call2 : this ) { if( this.last_call != 2) { serr | "Expected last_call to be 2 got" | this.last_call; } }
                or when( this.last_call == 2 ) waitfor( call3 : this ) { if( this.last_call != 3) { serr | "Expected last_call to be 3 got" | this.last_call; } }
                or when( this.last_call == 3 ) waitfor( call4 : this ) { if( this.last_call != 4) { serr | "Expected last_call to be 4 got" | this.last_call; } }
                or when( this.last_call == 4 ) waitfor( call5 : this ) { if( this.last_call != 5) { serr | "Expected last_call to be 5 got" | this.last_call; } }
                or when( this.last_call == 5 ) waitfor( call6 : this ) { if( this.last_call != 6) { serr | "Expected last_call to be 6 got" | this.last_call; } }

                sout | this.last_call;
        }

        this.done = true;
}

thread arbiter_t{};
void main( arbiter_t & this ) {
        arbiter( global );
}

int main() {
        srandom( time(NULL) );
        sout | "Starting";
        {
                arbiter_t arbiter;
                caller_t callers[7];

        }
        sout | "Stopping";
}