[Issue 11981] unittest 'host' deadlock

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=11981



--- Comment #12 from Stanislav Blinov <stanislav.blinov at gmail.com> 2014-02-08 20:23:11 PST ---
So the failing sequence boils down to this:

Main:                      | t:
                           |
// t.start():              |
                           |
slock.lock();              |
m_isRunning = true;        |
pthread_create();          |
// at this point,          |
// t.isRunning == true     |
add(this);                 |
// at this point,          |
// t is subject to         |
// thread_suspendAll       |
slock.unlock();            |
                           |
// thread_suspendAll():    |
slock.lock();              |
                           |
// suspend(t):             | // thread_entryPoint():
pthread_kill();            | getStackBottom(); 
                           | // or rt.tlsgc.init()
                           | // or (maybe?) Thread.setThis()

At this point, t *may* be inside malloc(). It catches SIGUSR1,
thread_suspendHandler() is called. Eventually, the handler gets to
Thread.getThis(), which calls malloc() again. If t already was inside malloc(),
it locks.

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