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57 lines
1.0 KiB
57 lines
1.0 KiB
6 years ago
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#include <stdlib.h>
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#include <assert.h>
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#ifdef __linux__
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#include <sys/eventfd.h>
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#else
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#include <sys/time.h>
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#include <sys/event.h>
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#define EVENT_IDENT 42
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#endif
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#include "efd.h"
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int efd_init() {
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#ifdef __linux__
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return eventfd(0, EFD_CLOEXEC);
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#else
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int fd = kqueue();
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assert(fd >= 0);
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struct kevent kev;
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EV_SET(&kev, EVENT_IDENT, EVFILT_USER, EV_ADD | EV_CLEAR, 0, 0, NULL);
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struct timespec timeout = {0, 0};
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int err = kevent(fd, &kev, 1, NULL, 0, &timeout);
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assert(err != -1);
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return fd;
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#endif
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}
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void efd_write(int fd) {
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#ifdef __linux__
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eventfd_write(fd, 1);
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#else
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struct kevent kev;
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EV_SET(&kev, EVENT_IDENT, EVFILT_USER, 0, NOTE_TRIGGER, 0, NULL);
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struct timespec timeout = {0, 0};
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int err = kevent(fd, &kev, 1, NULL, 0, &timeout);
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assert(err != -1);
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#endif
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}
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void efd_clear(int fd) {
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#ifdef __linux__
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eventfd_t efd_cnt;
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eventfd_read(fd, &efd_cnt);
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#else
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struct kevent kev;
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struct timespec timeout = {0, 0};
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int nfds = kevent(fd, NULL, 0, &kev, 1, &timeout);
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assert(nfds != -1);
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#endif
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}
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