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vm: more commentary on lock_console() stuff

db4
Joe Groff 2011-11-08 08:52:52 -08:00
parent 8337b08d0d
commit 0c58fd5c26
2 changed files with 6 additions and 0 deletions
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3
vm/debug.cpp
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@ -459,6 +459,9 @@ void factor_vm::factorbug()
std::cout << "Starting low level debugger..." << std::endl; std::cout << "Starting low level debugger..." << std::endl;
// Even though we've stopped the VM, the stdin_loop thread (see os-*.cpp)
// that pumps the console is still running concurrently. We lock a mutex so
// the thread will take a break and give us exclusive access to stdin.
lock_console(); lock_console();
if (!fep_help_was_shown) { if (!fep_help_was_shown) {

3
vm/os-unix.cpp
View File

@ -466,6 +466,9 @@ void factor_vm::open_console()
void factor_vm::lock_console() void factor_vm::lock_console()
{ {
// Lock the stdin_mutex and send the stdin_loop thread a signal to interrupt
// any read() it has in progress. When the stdin loop iterates again, it will
// try to lock the same mutex and wait until unlock_console() is called.
pthread_mutex_lock(&stdin_mutex); pthread_mutex_lock(&stdin_mutex);
pthread_kill(stdin_thread, SIGUSR2); pthread_kill(stdin_thread, SIGUSR2);
} }