From 8d2cfa9ea0bdc56458567707685faed5dbc49076 Mon Sep 17 00:00:00 2001 From: Daniel Borca Date: Mon, 26 Jan 2004 10:41:39 +0000 Subject: glutTimerFunc cleanup --- src/glut/dos/Makefile.DJ | 8 +- src/glut/dos/PC_HW/pc_timer.c | 208 +++++++++++++++++++++--------------------- src/glut/dos/callback.c | 33 ++++--- src/glut/dos/glutint.h | 4 +- 4 files changed, 132 insertions(+), 121 deletions(-) (limited to 'src') diff --git a/src/glut/dos/Makefile.DJ b/src/glut/dos/Makefile.DJ index 4586a0ba69..b7c770715d 100644 --- a/src/glut/dos/Makefile.DJ +++ b/src/glut/dos/Makefile.DJ @@ -20,7 +20,7 @@ # AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. -# DOS/DJGPP glut makefile v1.4 for Mesa +# DOS/DJGPP glut makefile v1.5 for Mesa # # Copyright (C) 2002 - Borca Daniel # Email : dborca@users.sourceforge.net @@ -34,7 +34,9 @@ # CFLAGS # # MKGLUT absolute path to original GLUT. -# default = $(TOP)/src-glut +# default = $(TOP)/src/glut/glx +# GLIDE path to Glide3 SDK; used to resolve DXEs. +# default = $(TOP)/glide3 # # Targets: # all: build GLUT @@ -46,7 +48,7 @@ .PHONY: all clean TOP = ../../.. -GLIDE ?= $(TOP)/include/glide3 +GLIDE ?= $(TOP)/glide3 MKGLUT ?= $(TOP)/src/glut/glx LIBDIR = $(TOP)/lib GLUT_LIB = libglut.a diff --git a/src/glut/dos/PC_HW/pc_timer.c b/src/glut/dos/PC_HW/pc_timer.c index f11917db1a..530ed72a49 100644 --- a/src/glut/dos/PC_HW/pc_timer.c +++ b/src/glut/dos/PC_HW/pc_timer.c @@ -1,5 +1,5 @@ /* - * PC/HW routine collection v1.4 for DOS/DJGPP + * PC/HW routine collection v1.5 for DOS/DJGPP * * Copyright (C) 2002 - Borca Daniel * Email : dborca@yahoo.com @@ -93,106 +93,6 @@ void pc_remove_timer (void) -/* Desc: install timer engine - * - * In : - - * Out : 0 for success - * - * Note: initial frequency is 18.2 Hz - */ -static int install_timer (void) -{ - if (timer_installed || pc_install_irq(TIMER_IRQ, timer)) { - return -1; - } else { - memset(timer_func, 0, sizeof(timer_func)); - - LOCKDATA(timer_func); - LOCKDATA(timer_main); - LOCKFUNC(timer); - - timer_main.counter = 0x10000; - - DISABLE(); - outportb(0x43, 0x34); - outportb(0x40, 0); - outportb(0x40, 0); - timer_main.clock_ticks = 0; - ENABLE(); - - pc_atexit(pc_remove_timer); - timer_installed = TRUE; - return 0; - } -} - - - -/* Desc: install timerfunc - * - * In : callback function, opaque pointer to be passed to callee, freq (Hz) - * Out : timerfunc id (0 .. MAX_TIMERS-1) - * - * Note: returns -1 if error - */ -int pc_install_int (PFUNC func, void *parm, unsigned int freq) -{ - int i; - TIMER *t = NULL; - - /* ensure the timer engine is set up */ - if (!timer_installed) { - if (install_timer()) { - return -1; - } - } - - /* find an empty slot */ - for (i = 0; i < MAX_TIMERS; i++) { - if (!timer_func[i].func) { - t = &timer_func[i]; - break; - } - } - if (t == NULL) { - return -1; - } - - DISABLE(); - - t->func = func; - t->parm = parm; - t->freq = freq; - t->clock_ticks = 0; - - /* update main timer / sons to match highest frequency */ - if (freq > timer_main.freq) { - unsigned int new_counter = PIT_FREQ / freq; - - for (i = 0; i < MAX_TIMERS; i++) { - if (timer_func[i].func) { - ADJUST(timer_func[i], freq); - } - } - - outportb(0x43, 0x34); - outportb(0x40, (unsigned char)new_counter); - outportb(0x40, (unsigned char)(new_counter>>8)); - timer_main.clock_ticks = 0; - timer_main.counter = new_counter; - timer_main.freq = freq; - } else { - /* t == &timer_func[i] */ - ADJUST(timer_func[i], timer_main.freq); - } - - ENABLE(); - - return t - timer_func; -} - - - /* Desc: remove timerfunc * * In : timerfunc id @@ -255,7 +155,7 @@ int pc_remove_int (int fid) } return 0; -} +} ENDOFUNC(pc_remove_int) @@ -320,4 +220,108 @@ int pc_adjust_int (int fid, unsigned int freq) ENABLE(); return 0; +} ENDOFUNC(pc_adjust_int) + + + +/* Desc: install timer engine + * + * In : - + * Out : 0 for success + * + * Note: initial frequency is 18.2 Hz + */ +static int install_timer (void) +{ + if (timer_installed || pc_install_irq(TIMER_IRQ, timer)) { + return -1; + } else { + memset(timer_func, 0, sizeof(timer_func)); + + LOCKDATA(timer_func); + LOCKDATA(timer_main); + LOCKFUNC(timer); + LOCKFUNC(pc_adjust_int); + LOCKFUNC(pc_remove_int); + + timer_main.counter = 0x10000; + + DISABLE(); + outportb(0x43, 0x34); + outportb(0x40, 0); + outportb(0x40, 0); + timer_main.clock_ticks = 0; + ENABLE(); + + pc_atexit(pc_remove_timer); + timer_installed = TRUE; + return 0; + } +} + + + +/* Desc: install timerfunc + * + * In : callback function, opaque pointer to be passed to callee, freq (Hz) + * Out : timerfunc id (0 .. MAX_TIMERS-1) + * + * Note: returns -1 if error + */ +int pc_install_int (PFUNC func, void *parm, unsigned int freq) +{ + int i; + TIMER *t = NULL; + + /* ensure the timer engine is set up */ + if (!timer_installed) { + if (install_timer()) { + return -1; + } + } + + /* find an empty slot */ + for (i = 0; i < MAX_TIMERS; i++) { + if (!timer_func[i].func) { + t = &timer_func[i]; + break; + } + } + if (t == NULL) { + return -1; + } + + DISABLE(); + + t->func = func; + t->parm = parm; + t->freq = freq; + t->clock_ticks = 0; + + /* update main timer / sons to match highest frequency */ + if (freq > timer_main.freq) { + unsigned int new_counter = PIT_FREQ / freq; + + for (i = 0; i < MAX_TIMERS; i++) { + if (timer_func[i].func) { + ADJUST(timer_func[i], freq); + } + } + + outportb(0x43, 0x34); + outportb(0x40, (unsigned char)new_counter); + outportb(0x40, (unsigned char)(new_counter>>8)); + timer_main.clock_ticks = 0; + timer_main.counter = new_counter; + timer_main.freq = freq; + } else { + /* t == &timer_func[i] */ + ADJUST(timer_func[i], timer_main.freq); + } + + i = t - timer_func; + + ENABLE(); + + return i; } diff --git a/src/glut/dos/callback.c b/src/glut/dos/callback.c index 174cbdda99..773dfb2758 100644 --- a/src/glut/dos/callback.c +++ b/src/glut/dos/callback.c @@ -19,7 +19,7 @@ */ /* - * DOS/DJGPP glut driver v1.4 for Mesa + * DOS/DJGPP glut driver v1.5 for Mesa * * Copyright (C) 2002 - Borca Daniel * Email : dborca@yahoo.com @@ -38,8 +38,6 @@ typedef struct { int fid; /* func-id as returned from PCHW */ } GLUTSShotCB; -static GLboolean g_sscb_semaphore; - GLUTidleCB g_idle_func = NULL; @@ -47,11 +45,12 @@ GLUTidleCB g_idle_func = NULL; static void g_single_shot_callback (void *opaque) { GLUTSShotCB *cb = (GLUTSShotCB *)opaque; - while (g_sscb_semaphore) { - } if (!--cb->ttl) { cb->func(cb->value); pc_remove_int(cb->fid); + /* We won't be needing this slot anymore, so free it. This operation + * must be the last thing, and must be atomic, to mutex `glutTimerFunc' + */ cb->func = NULL; } } ENDOFUNC(g_single_shot_callback) @@ -139,7 +138,6 @@ void APIENTRY glutTimerFunc (unsigned int millis, GLUTtimerCB func, int value) if (virgin) { virgin = GL_FALSE; LOCKDATA(g_sscb); - LOCKDATA(g_sscb_semaphore); LOCKFUNC(g_single_shot_callback); /* we should lock the callee also... */ } @@ -153,20 +151,27 @@ void APIENTRY glutTimerFunc (unsigned int millis, GLUTtimerCB func, int value) freq = 1000 / millis; ttl = 1; } - g_sscb_semaphore++; for (i = 0; i < MAX_SSHOT_CB; i++) { if (g_sscb[i].func == NULL) { - int fid = pc_install_int((PFUNC)func, &g_sscb[i], freq); - if (fid >= 0) { - g_sscb[i].func = func; - g_sscb[i].value = value; - g_sscb[i].ttl = ttl; - g_sscb[i].fid = fid; + /* We will be needing this slot, so alloc it. This operation + * must be the first thing, and must be atomic, to mutex callbacks! + */ + g_sscb[i].func = func; + g_sscb[i].value = value; + g_sscb[i].ttl = ttl; + /* There is a very small gap here: `pc_install_int' enables + * interrupts just before returning FID value (which will be + * used inside callback). The critical gap is 1 millisecond + * - which I'm sure we won't overrun... + */ + g_sscb[i].fid = pc_install_int((PFUNC)func, &g_sscb[i], freq); + if (g_sscb[i].fid < 0) { + /* Interrupt could not be set! Release the slot back */ + g_sscb[i].func = NULL; } break; } } - g_sscb_semaphore--; } } diff --git a/src/glut/dos/glutint.h b/src/glut/dos/glutint.h index 2cd0dde1b8..12750041fe 100644 --- a/src/glut/dos/glutint.h +++ b/src/glut/dos/glutint.h @@ -19,7 +19,7 @@ */ /* - * DOS/DJGPP glut driver v1.5 for Mesa + * DOS/DJGPP glut driver v1.6 for Mesa * * Copyright (C) 2002 - Borca Daniel * Email : dborca@users.sourceforge.net @@ -146,7 +146,7 @@ extern void *__glutFont(void *font); #define MAX_WINDOWS 2 -#define MAX_SSHOT_CB 10 +#define MAX_SSHOT_CB 8 #define RESERVED_COLORS 0 -- cgit v1.2.3