Mercurial > sdl-ios-xcode
view src/thread/beos/SDL_syssem.c @ 816:428f688f2ad2
Date: Fri, 13 Feb 2004 17:03:16 +0100
From: Max Horn
Subject: Modifier key fix
The internal modifier state can get out of sync with reality. To
trigger this, do for example this:
1) Launch an SDL app
2) Alt-click on the desktop (this will hide the SDL app).
3) Bring the SDL app back to the front
4) SDL will still think alt is pressed (and as such will treat left
clicks like middle clicks). If you press and release alt, it'll be fine
again.
The attached patch cures this by rechecking the modifier state whenever
we process an event.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Fri, 13 Feb 2004 17:57:16 +0000 |
parents | b8d311d90021 |
children | ab0154afe938 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2004 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with this library; if not, write to the Free Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Sam Lantinga slouken@libsdl.org */ #ifdef SAVE_RCSID static char rcsid = "@(#) $Id$"; #endif /* Semaphores in the BeOS environment */ #include <be/kernel/OS.h> #include "SDL_error.h" #include "SDL_thread.h" struct SDL_semaphore { sem_id id; }; /* Create a counting semaphore */ SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) { SDL_sem *sem; sem = (SDL_sem *)malloc(sizeof(*sem)); if ( sem ) { sem->id = create_sem(initial_value, "SDL semaphore"); if ( sem->id < B_NO_ERROR ) { SDL_SetError("create_sem() failed"); free(sem); sem = NULL; } } else { SDL_OutOfMemory(); } return(sem); } /* Free the semaphore */ void SDL_DestroySemaphore(SDL_sem *sem) { if ( sem ) { if ( sem->id >= B_NO_ERROR ) { delete_sem(sem->id); } free(sem); } } int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) { int32 val; int retval; if ( ! sem ) { SDL_SetError("Passed a NULL semaphore"); return -1; } tryagain: if ( timeout == SDL_MUTEX_MAXWAIT ) { val = acquire_sem(sem->id); } else { timeout *= 1000; /* BeOS uses a timeout in microseconds */ val = acquire_sem_etc(sem->id, 1, B_RELATIVE_TIMEOUT, timeout); } switch (val) { case B_INTERRUPTED: goto tryagain; case B_NO_ERROR: retval = 0; break; default: SDL_SetError("acquire_sem() failed"); retval = -1; break; } return retval; } int SDL_SemTryWait(SDL_sem *sem) { return SDL_SemWaitTimeout(sem, 0); } int SDL_SemWait(SDL_sem *sem) { return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); } /* Returns the current count of the semaphore */ Uint32 SDL_SemValue(SDL_sem *sem) { int32 count; Uint32 value; value = 0; if ( sem ) { get_sem_count(sem->id, &count); if ( count > 0 ) { value = (Uint32)count; } } return value; } /* Atomically increases the semaphore's count (not blocking) */ int SDL_SemPost(SDL_sem *sem) { if ( ! sem ) { SDL_SetError("Passed a NULL semaphore"); return -1; } if ( release_sem(sem->id) != B_NO_ERROR ) { SDL_SetError("release_sem() failed"); return -1; } return 0; }