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Use a POSIX lock for pkgdb and only issue pkgdb writes in exact points.

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- Rather than using a POSIX named semaphore use a POSIX lock (lockf(3))
for pkgdb for writers. Writers that cannot acquire the pkgdb lock will
get EAGAIN rather then being blocked.

- Due to using a file lock we cannot write the pkgdb every time a package
is being unpacked, configured or removed. Instead pkgdb is only written
at the end of a specific point in the transaction (unpack, configure, remove)
or via xbps_pkgdb_unlock().
This commit is contained in:
Juan RP
2014-03-04 14:37:10 +01:00
parent 6335573180
commit 0416b067d0
11 changed files with 85 additions and 101 deletions
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25
bin/xbps-reconfigure/main.c
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@@ -153,17 +153,22 @@ main(int argc, char **argv)
exit(EXIT_FAILURE);
}
if (all) {
rv = xbps_configure_packages(&xh, true);
} else {
for (i = optind; i < argc; i++) {
rv = xbps_configure_pkg(&xh, argv[i],
true, false, true);
if (rv != 0)
fprintf(stderr, "Failed to reconfigure "
"`%s': %s\n", argv[i], strerror(rv));
}
if ((rv = xbps_pkgdb_lock(&xh)) != 0) {
fprintf(stderr, "failed to lock pkgdb: %s\n", strerror(rv));
exit(EXIT_FAILURE);
}
if (all) {
rv = xbps_configure_packages(&xh);
} else {
for (i = optind; i < argc; i++) {
rv = xbps_configure_pkg(&xh, argv[i], true, false);
if (rv != 0) {
fprintf(stderr, "Failed to reconfigure "
"`%s': %s\n", argv[i], strerror(rv));
}
}
}
xbps_pkgdb_unlock(&xh);
exit(rv ? EXIT_FAILURE : EXIT_SUCCESS);
}