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* nscd/nscd_helper.c: Add a few __builtin_expect.

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This commit is contained in:
Ulrich Drepper 2005-07-14 02:53:33 +00:00
parent a08ab89700
commit f45729d8cd
2 changed files with 22 additions and 14 deletions
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2
ChangeLog
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@ -1,5 +1,7 @@
2005-07-13 Ulrich Drepper <drepper@redhat.com> 2005-07-13 Ulrich Drepper <drepper@redhat.com>
* nscd/nscd_helper.c: Add a few __builtin_expect.
* nscd/connections.c (send_ro_fd): Make sure BUF is aligned correctly. * nscd/connections.c (send_ro_fd): Make sure BUF is aligned correctly.
* nscd/nscd_helper.c (wait_on_socket): New function. * nscd/nscd_helper.c (wait_on_socket): New function.
(get_mapping): Use wait_on_socket instead of poll. The former handles (get_mapping): Use wait_on_socket instead of poll. The former handles

34
nscd/nscd_helper.c
View File

@ -197,8 +197,8 @@ get_mapping (request_type type, const char *key,
iov[1].iov_base = (void *) key; iov[1].iov_base = (void *) key;
iov[1].iov_len = keylen; iov[1].iov_len = keylen;
if (TEMP_FAILURE_RETRY (__writev (sock, iov, 2)) if (__builtin_expect (TEMP_FAILURE_RETRY (__writev (sock, iov, 2))
!= iov[0].iov_len + iov[1].iov_len) != iov[0].iov_len + iov[1].iov_len, 0))
/* We cannot even write the request. */ /* We cannot even write the request. */
goto out_close2; goto out_close2;
@ -233,41 +233,47 @@ get_mapping (request_type type, const char *key,
#ifndef MSG_NOSIGNAL #ifndef MSG_NOSIGNAL
# define MSG_NOSIGNAL 0 # define MSG_NOSIGNAL 0
#endif #endif
if (TEMP_FAILURE_RETRY (__recvmsg (sock, &msg, MSG_NOSIGNAL)) != keylen) if (__builtin_expect (TEMP_FAILURE_RETRY (__recvmsg (sock, &msg,
MSG_NOSIGNAL))
!= keylen, 0))
goto out_close2; goto out_close2;
mapfd = *(int *) CMSG_DATA (cmsg); mapfd = *(int *) CMSG_DATA (cmsg);
if (CMSG_FIRSTHDR (&msg)->cmsg_len != CMSG_LEN (sizeof (int))) if (__builtin_expect (CMSG_FIRSTHDR (&msg)->cmsg_len
!= CMSG_LEN (sizeof (int)), 0))
goto out_close; goto out_close;
struct stat64 st; struct stat64 st;
if (strcmp (resdata, key) != 0 if (__builtin_expect (strcmp (resdata, key) != 0, 0)
|| fstat64 (mapfd, &st) != 0 || __builtin_expect (fstat64 (mapfd, &st) != 0, 0)
|| st.st_size < sizeof (struct database_pers_head)) || __builtin_expect (st.st_size < sizeof (struct database_pers_head), 0))
goto out_close; goto out_close;
struct database_pers_head head; struct database_pers_head head;
if (TEMP_FAILURE_RETRY (__pread (mapfd, &head, sizeof (head), 0)) if (__builtin_expect (TEMP_FAILURE_RETRY (__pread (mapfd, &head,
!= sizeof (head)) sizeof (head), 0))
!= sizeof (head), 0))
goto out_close; goto out_close;
if (head.version != DB_VERSION || head.header_size != sizeof (head) if (__builtin_expect (head.version != DB_VERSION, 0)
|| __builtin_expect (head.header_size != sizeof (head), 0)
/* This really should not happen but who knows, maybe the update /* This really should not happen but who knows, maybe the update
thread got stuck. */ thread got stuck. */
|| (! head.nscd_certainly_running || __builtin_expect (! head.nscd_certainly_running
&& head.timestamp + MAPPING_TIMEOUT < time (NULL))) && head.timestamp + MAPPING_TIMEOUT < time (NULL),
0))
goto out_close; goto out_close;
size_t size = (sizeof (head) + roundup (head.module * sizeof (ref_t), ALIGN) size_t size = (sizeof (head) + roundup (head.module * sizeof (ref_t), ALIGN)
+ head.data_size); + head.data_size);
if (st.st_size < size) if (__builtin_expect (st.st_size < size, 0))
goto out_close; goto out_close;
/* The file is large enough, map it now. */ /* The file is large enough, map it now. */
void *mapping = __mmap (NULL, size, PROT_READ, MAP_SHARED, mapfd, 0); void *mapping = __mmap (NULL, size, PROT_READ, MAP_SHARED, mapfd, 0);
if (mapping != MAP_FAILED) if (__builtin_expect (mapping != MAP_FAILED, 1))
{ {
/* Allocate a record for the mapping. */ /* Allocate a record for the mapping. */
struct mapped_database *newp = malloc (sizeof (*newp)); struct mapped_database *newp = malloc (sizeof (*newp));