Giacomo Tesio
1bc08b7631
This commit introduce a special rendezvous point at (void*)~0 that cannot be reached by any process, since it's not added to the rendezvous group. This turns the rendezvous syscall to a cheap way to block until either a note or a wakeup from awake(2) occurs. This new feature is used in libc's sleep: the test qa/kern/fork_chain has shown that using a stack address as rendezvous point is not safe enougth for sleep, since two different process forked from the same function can call sleep with the same base pointer. This lead the wakeup variable in jehanne_sleep to have the same address on both process. TODO add a test that show this behaviour in the old code. |
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