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authorEric Wong <normalperson@yhbt.net>2006-07-30 03:43:38 +0000
committerEric Wong <normalperson@yhbt.net>2006-07-30 03:43:38 +0000
commit4cf5d04ca15bc28ee4636d1dccb858763513e571 (patch)
tree7898902e786f5763643a513ea96bcada8a2559cc /src/gcc.h
parent4d5b8509eb46cff40890b781018669233a79e414 (diff)
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interface/connection malloc reductions from mpd-ke
This patch massively reduces the amount of heap allocations at the interface/command layer. Most commands with minimal output should not allocate memory from the heap at all. Things like repeatedly polling status, currentsong, and volume changes should be faster as a result, and more importantly, not a source of memory fragmentation. These changes should be safe in that there's no way for a remote-client to corrupt memory or otherwise do bad stuff to MPD, but an extra set of eyes to review would be good. Of course there's never any warranty :) No longer do we use FILE * structures in the interface, which means we don't have to allocate any new memory for most connections. Now, before you go on about losing the buffering that FILE * +implies+, remember that myfprintf() never took advantage of any of the stdio buffering features. To reduce the diff and make bugs easier to spot in the diff, I've kept myfprintf in places where we write to files (and not network interfaces). Expect myfprintf to go away entirely soon (we'll use fprintf for writing regular files). git-svn-id: https://svn.musicpd.org/mpd/trunk@4483 09075e82-0dd4-0310-85a5-a0d7c8717e4f
Diffstat (limited to '')
-rw-r--r--src/gcc.h50
1 files changed, 50 insertions, 0 deletions
diff --git a/src/gcc.h b/src/gcc.h
new file mode 100644
index 000000000..62c78e733
--- /dev/null
+++ b/src/gcc.h
@@ -0,0 +1,50 @@
+#ifndef MPD_GCC_H
+#define MPD_GCC_H
+
+/* this allows us to take advantage of special gcc features while still
+ * allowing other compilers to compile:
+ *
+ * example taken from: http://rlove.org/log/2005102601
+ */
+
+/* disabled (0) until I fix all the warnings :) */
+#if (0 && __GNUC__ >= 3)
+# define mpd_const __attribute__ ((const))
+# define mpd_deprecated __attribute__ ((deprecated))
+# define mpd_malloc __attribute__ ((malloc))
+# define mpd_must_check __attribute__ ((warn_unused_result))
+# define mpd_noreturn __attribute__ ((noreturn))
+# define mpd_packed __attribute__ ((packed))
+/* these are very useful for type checking */
+# define mpd_printf __attribute__ ((format(printf,1,2)))
+# define mpd_fprintf __attribute__ ((format(printf,2,3)))
+# define mpd_fprintf_ __attribute__ ((format(printf,3,4)))
+# define mpd_pure __attribute__ ((pure))
+# define mpd_scanf __attribute__ ((format(scanf,1,2)))
+# define mpd_unused __attribute__ ((unused))
+# define mpd_used __attribute__ ((used))
+/* # define inline inline __attribute__ ((always_inline)) */
+# define mpd_noinline __attribute__ ((noinline))
+# define likely(x) __builtin_expect (!!(x), 1)
+# define unlikely(x) __builtin_expect (!!(x), 0)
+#else
+# define mpd_const
+# define mpd_deprecated
+# define mpd_malloc
+# define mpd_must_check
+# define mpd_noreturn
+# define mpd_packed
+# define mpd_printf
+# define mpd_fprintf
+# define mpd_fprintf_
+# define mpd_pure
+# define mpd_scanf
+# define mpd_unused
+# define mpd_used
+/* # define inline */
+# define mpd_noinline
+# define likely(x) (x)
+# define unlikely(x) (x)
+#endif
+
+#endif /* MPD_GCC_H */