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Diffstat (limited to 'ev.pod')
| -rw-r--r-- | ev.pod | 32 |
1 files changed, 32 insertions, 0 deletions
@@ -3262,6 +3262,38 @@ calling select (O(n²)) will likely make this unworkable. =back +=head1 PORTABILITY REQUIREMENTS + +In addition to a working ISO-C implementation, libev relies on a few +additional extensions: + +=over 4 + +=item C<sig_atomic_t volatile> must be thread-atomic as well + +The type C<sig_atomic_t volatile> (or whatever is defined as +C<EV_ATOMIC_T>) must be atomic w.r.t. accesses from different +threads. This is not part of the specification for C<sig_atomic_t>, but is +believed to be sufficiently portable. + +=item C<sigprocmask> must work in a threaded environment + +Libev uses C<sigprocmask> to temporarily block signals. This is not +allowed in a threaded program (C<pthread_sigmask> has to be used). Typical +pthread implementations will either allow C<sigprocmask> in the "main +thread" or will block signals process-wide, both behaviours would +be compatible with libev. Interaction between C<sigprocmask> and +C<pthread_sigmask> could complicate things, however. + +The most portable way to handle signals is to block signals in all threads +except the initial one, and run the default loop in the initial thread as +well. + +=back + +If you know of other additional requirements drop me a note. + + =head1 AUTHOR Marc Lehmann <libev@schmorp.de>. |