ef307e8ec6
This commit contains a number of related mailbox issues: - Add extra parameters to mailbox_respond_receive to allow both the number of bytes/handles passed in, and the size of the byte/handle buffers to be passed in. - Don't delete mailbox messages on receipt if the caller is waiting on reply - Correctly pass status messages along with a mailbox::replyer object - Actually wake the calling thread in the mailbox::replyer dtor - Make sure to release locks _before_ calling thread::wake() on blocked threads, as that may cause them to be scheduled ahead of the current thread.
50 lines
922 B
C++
50 lines
922 B
C++
#include "objects/event.h"
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#include "objects/thread.h"
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namespace obj {
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event::event() :
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kobject {type::event},
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m_signals {0}
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{}
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event::~event() {}
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void
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event::signal(uint64_t s)
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{
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uint64_t after = __atomic_or_fetch(&m_signals, s, __ATOMIC_SEQ_CST);
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if (after) wake_observer();
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}
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uint64_t
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event::wait()
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{
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// If events are pending, grab those and return immediately
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uint64_t value = read();
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if (value)
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return value;
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// Wait for event::signal() to wake us with a value
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thread ¤t = thread::current();
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m_queue.add_thread(¤t);
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return current.block();
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}
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void
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event::wake_observer()
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{
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util::scoped_lock lock {m_queue.get_lock()};
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thread *t = m_queue.get_next_unlocked();
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if (!t) return;
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uint64_t value = read();
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if (value) {
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m_queue.pop_next_unlocked();
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lock.release();
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t->wake(value);
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}
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}
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} // namespace obj
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