gecko-dev/ipc/ipdl/test/cxx/PTestInterruptRaces.ipdl

namespace mozilla {
namespace _ipdltest {

intr protocol PTestInterruptRaces {
both:
    intr Race() returns (bool hasReply);
    intr StackFrame() returns ();
    intr StackFrame3() returns ();

parent:
    sync StartRace();
    intr Parent();
    sync GetAnsweredParent() returns (bool answeredParent);

child:
    Start();
    Wakeup();
    Wakeup3();
    intr Child();
    __delete__();

state START:
    send Start goto TEST1;

// First test: race while no other messages are on the Interrupt stack
state TEST1:
    recv StartRace goto RACE1;
state RACE1:
    call Race goto DUMMY1_1;
    answer Race goto DUMMY1_2;
state DUMMY1_1:
    answer Race goto TEST2;
state DUMMY1_2:
    call Race goto TEST2;

// Second test: race while other messages are on the Interrupt stack
state TEST2:
    call StackFrame goto MORESTACK;
state MORESTACK:
    answer StackFrame goto STARTRACE;
state STARTRACE:
    send Wakeup goto RACE2;
state RACE2:
    call Race goto DUMMY2_1;
    answer Race goto DUMMY2_2;
state DUMMY2_1:
    answer Race goto TEST3;
state DUMMY2_2:
    call Race goto TEST3;

// Third test: resolve race using custom policy
state TEST3:
    call StackFrame3 goto MORESTACK3;
state MORESTACK3:
    answer StackFrame3 goto STARTRACE3;
state STARTRACE3:
    send Wakeup3 goto RACE3;
state RACE3:
    call Child goto DUMMY3_1;
    answer Parent goto DUMMY3_2;
state DUMMY3_1:
    // the parent receives this from the child in this state
    recv GetAnsweredParent goto CHECK;
    // this transition is never taken (if the custom race resolution
    // works correctly)
    answer Parent goto CHECK;
state DUMMY3_2:
    call Child goto CHECK;
state CHECK:
    // the child sends this from this state
    recv GetAnsweredParent goto DYING;
    // because of deferred processing, the parent receives the child's
    // message here
    answer Parent goto DYING;


state DYING:
    send __delete__;
};

} // namespace _ipdltest
} // namespace mozilla