summaryrefslogtreecommitdiff
path: root/src/aio/lio_listio.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/aio/lio_listio.c')
-rw-r--r--src/aio/lio_listio.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/src/aio/lio_listio.c b/src/aio/lio_listio.c
new file mode 100644
index 00000000..8865029a
--- /dev/null
+++ b/src/aio/lio_listio.c
@@ -0,0 +1,140 @@
+#include <aio.h>
+#include <errno.h>
+#include "pthread_impl.h"
+
+struct lio_state {
+ struct sigevent *sev;
+ int cnt;
+ struct aiocb *cbs[];
+};
+
+static int lio_wait(struct lio_state *st)
+{
+ int i, err, got_err;
+ int cnt = st->cnt;
+ struct aiocb **cbs = st->cbs;
+
+ for (;;) {
+ for (i=0; i<cnt; i++) {
+ if (!cbs[i]) continue;
+ err = aio_error(cbs[i]);
+ if (err==EINPROGRESS)
+ break;
+ if (err) got_err=1;
+ cbs[i] = 0;
+ }
+ if (i==cnt) {
+ if (got_err) {
+ errno = EIO;
+ return -1;
+ }
+ return 0;
+ }
+ if (aio_suspend(cbs, cnt, 0))
+ return -1;
+ }
+}
+
+static void notify_signal(struct sigevent *sev)
+{
+ siginfo_t si = {
+ .si_signo = sev->sigev_signo,
+ .si_value = sev->sigev_value,
+ .si_code = SI_ASYNCIO,
+ .si_pid = __pthread_self()->pid,
+ .si_uid = getuid()
+ };
+ __syscall(SYS_rt_sigqueueinfo, si.si_pid, si.si_signo, &si);
+}
+
+static void *wait_thread(void *p)
+{
+ struct lio_state *st = p;
+ struct sigevent *sev = st->sev;
+ lio_wait(st);
+ free(st);
+ switch (sev->sigev_notify) {
+ case SIGEV_SIGNAL:
+ notify_signal(sev);
+ break;
+ case SIGEV_THREAD:
+ sev->sigev_notify_function(sev->sigev_value);
+ break;
+ }
+ return 0;
+}
+
+int lio_listio(int mode, struct aiocb *const cbs[], int cnt, struct sigevent *sev)
+{
+ int i, ret;
+ struct lio_state *st=0;
+
+ if (cnt < 0) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (mode == LIO_WAIT || (sev && sev->sigev_notify != SIGEV_NONE)) {
+ if (!(st = malloc(sizeof *st + cnt*sizeof *cbs))) {
+ errno = EAGAIN;
+ return -1;
+ }
+ st->cnt = cnt;
+ st->sev = sev;
+ memcpy(st->cbs, cbs, cnt*sizeof *cbs);
+ }
+
+ for (i=0; i<cnt; i++) {
+ if (!cbs[i]) continue;
+ switch (cbs[i]->aio_lio_opcode) {
+ case LIO_READ:
+ ret = aio_read(cbs[i]);
+ break;
+ case LIO_WRITE:
+ ret = aio_write(cbs[i]);
+ break;
+ default:
+ continue;
+ }
+ if (ret) {
+ free(st);
+ errno = EAGAIN;
+ return -1;
+ }
+ }
+
+ if (mode == LIO_WAIT) {
+ ret = lio_wait(st);
+ free(st);
+ return 0;
+ }
+
+ if (st) {
+ pthread_attr_t a;
+ sigset_t set;
+ pthread_t td;
+
+ if (sev->sigev_notify == SIGEV_THREAD) {
+ if (sev->sigev_notify_attributes)
+ a = *sev->sigev_notify_attributes;
+ else
+ pthread_attr_init(&a);
+ } else {
+ pthread_attr_init(&a);
+ pthread_attr_setstacksize(&a, PAGE_SIZE);
+ pthread_attr_setguardsize(&a, 0);
+ }
+ pthread_attr_setdetachstate(&a, PTHREAD_CREATE_DETACHED);
+ sigfillset(&set);
+ pthread_sigmask(SIG_BLOCK, &set, &set);
+ if (pthread_create(&td, &a, wait_thread, st)) {
+ free(st);
+ errno = EAGAIN;
+ return -1;
+ }
+ pthread_sigmask(SIG_SETMASK, &set, 0);
+ }
+
+ return 0;
+}
+