Von: Thomas Zimmermann Betreff: [SDL] [PATCH] Make static variables const Datum: Tue, 19 May 2009 19:45:37 +0200 Hi, this is a set of simple changes which make some of SDL's internal static arrays constant. The purpose is to shrink the number of write-able static bytes and thus increase the number of memory pages shared between SDL applications. The patch set is against trunk@4513. Each of the attached patch files is specific to a sub-system. The set is completed by a second mail, because of the list's 40 KiB limit. The files readelf-r4513.txt and readelf-const-patch.txt where made by calling 'readelf -S libSDL.so'. They show the difference in ELF sections without and with the patch. Some numbers measured on my x86-64: Before [13] .rodata PROGBITS 00000000000eaaa0 000eaaa0 0000000000008170 0000000000000000 A 0 0 32 [19] .data.rel.ro PROGBITS 00000000003045e0 001045e0 00000000000023d0 0000000000000000 WA 0 0 32 [23] .data PROGBITS 00000000003076e0 001076e0 0000000000004988 0000000000000000 WA 0 0 32 After [13] .rodata PROGBITS 00000000000eaaa0 000eaaa0 0000000000009a50 0000000000000000 A 0 0 32 [19] .data.rel.ro PROGBITS 0000000000306040 00106040 0000000000002608 0000000000000000 WA 0 0 32 [23] .data PROGBITS 0000000000309360 00109360 0000000000002e88 0000000000000000 WA 0 0 32 The size of the write-able data section decreased considerably. Some entries became const-after-relocation, while most of its content went straight into the read-only data section. Best regards, Thomas

.TH "SDL_PushEvent" "3" "Tue 11 Sep 2001, 22:59" "SDL" "SDL API Reference" 
.SH "NAME"
SDL_PushEvent \- Pushes an event onto the event queue
.SH "SYNOPSIS"
.PP
\fB#include "SDL\&.h"
.sp
\fBint \fBSDL_PushEvent\fP\fR(\fBSDL_Event *event\fR);
.SH "DESCRIPTION"
.PP
The event queue can actually be used as a two way communication channel\&. Not only can events be read from the queue, but the user can also push their own events onto it\&. \fBevent\fR is a pointer to the event structure you wish to push onto the queue\&.
.PP
.RS
\fBNote:  
.PP
Pushing device input events onto the queue doesn\&'t modify the state of the device within SDL\&.
.RE
.SH "RETURN VALUE"
.PP
Returns \fB0\fR on success or \fB-1\fR if the event couldn\&'t be pushed\&.
.SH "EXAMPLES"
.PP
See \fI\fBSDL_Event\fR\fR\&.
.SH "SEE ALSO"
.PP
\fI\fBSDL_PollEvent\fP\fR, \fI\fBSDL_PeepEvents\fP\fR, \fI\fBSDL_Event\fR\fR
...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 22:59