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Remove cothreads.[ch] from tests/cothreads/ and replace then with a rule in the Makefile.am to generate symlinks to t...
Original commit message from CVS: Remove cothreads.[ch] from tests/cothreads/ and replace then with a rule in the Makefile.am to generate symlinks to the live versions of the code in gst/ : fixes a compile error, and should keep things cleaner.
This commit is contained in:
Richard Boulton
parent
34811a366d
commit
ed8dac9fa8
3 changed files with 5 additions and 231 deletions
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@ -9,3 +9,8 @@ simple_CFLAGS = $(shell gnome-config --cflags gnomeui)
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simple_LDFLAGS = $(shell gnome-config --libs gnomeui)
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noinst_HEADERS = cothreads.h object.h looper.h
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cothreads.c: $(top_srcdir)/gst/cothreads.c
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ln -sf $< $@
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cothreads.h: $(top_srcdir)/gst/cothreads.h
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ln -sf $< $@
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@ -1,183 +0,0 @@
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#include <pthread.h>
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#include <sys/time.h>
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#include <linux/linkage.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <setjmp.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#define DEBUG_ENABLED
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#include "gst/gst.h"
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#include "cothreads.h"
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#include "gst/gstarch.h"
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pthread_key_t _cothread_key = -1;
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cothread_state *cothread_create(cothread_context *ctx) {
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cothread_state *s;
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DEBUG("cothread: pthread_self() %ld\n",pthread_self());
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//if (pthread_self() == 0) {
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if (0) {
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s = (cothread_state *)malloc(sizeof(int) * COTHREAD_STACKSIZE);
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DEBUG("cothread: new stack at %p\n",s);
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} else {
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char *sp = CURRENT_STACK_FRAME;
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unsigned long *stack_end = (unsigned long *)((unsigned long)sp &
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~(STACK_SIZE - 1));
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s = (cothread_state *)(stack_end + ((ctx->nthreads - 1) *
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COTHREAD_STACKSIZE));
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if (mmap((char *)s,COTHREAD_STACKSIZE*(sizeof(int)),
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PROT_READ|PROT_WRITE|PROT_EXEC,MAP_PRIVATE|MAP_ANONYMOUS,
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-1,0) < 0) {
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perror("mmap'ing cothread stack space");
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return NULL;
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}
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}
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s->ctx = ctx;
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s->threadnum = ctx->nthreads;
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s->flags = 0;
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s->sp = ((int *)s + COTHREAD_STACKSIZE);
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ctx->threads[ctx->nthreads++] = s;
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DEBUG("cothread: created cothread at %p %p\n",s, s->sp);
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return s;
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}
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void cothread_setfunc(cothread_state *thread,cothread_func func,int argc,char **argv) {
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thread->func = func;
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thread->argc = argc;
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thread->argv = argv;
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thread->pc = (int *)func;
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}
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cothread_context *cothread_init() {
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cothread_context *ctx = (cothread_context *)malloc(sizeof(cothread_context));
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if (_cothread_key == -1) {
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if (pthread_key_create(&_cothread_key,NULL) != 0) {
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perror("pthread_key_create");
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return NULL;
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}
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}
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pthread_setspecific(_cothread_key,ctx);
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memset(ctx->threads,0,sizeof(ctx->threads));
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ctx->threads[0] = (cothread_state *)malloc(sizeof(cothread_state));
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ctx->threads[0]->ctx = ctx;
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ctx->threads[0]->threadnum = 0;
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ctx->threads[0]->func = NULL;
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ctx->threads[0]->argc = 0;
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ctx->threads[0]->argv = NULL;
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ctx->threads[0]->flags = COTHREAD_STARTED;
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ctx->threads[0]->sp = (int *)CURRENT_STACK_FRAME;
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ctx->threads[0]->pc = 0;
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DEBUG("cothread: 0th thread is at %p %p\n",ctx->threads[0], ctx->threads[0]->sp);
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// we consider the initiating process to be cothread 0
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ctx->nthreads = 1;
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ctx->current = 0;
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return ctx;
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}
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cothread_state *cothread_main(cothread_context *ctx) {
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// fprintf(stderr,"returning %p, the 0th cothread\n",ctx->threads[0]);
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return ctx->threads[0];
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}
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void cothread_stub() {
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cothread_context *ctx = pthread_getspecific(_cothread_key);
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register cothread_state *thread = ctx->threads[ctx->current];
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DEBUG("cothread: cothread_stub() entered\n");
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thread->flags |= COTHREAD_STARTED;
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if (thread->func)
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thread->func(thread->argc,thread->argv);
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thread->flags &= ~COTHREAD_STARTED;
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thread->pc = 0;
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DEBUG("cothread: cothread_stub() exit\n");
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//printf("uh, yeah, we shouldn't be here, but we should deal anyway\n");
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}
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void cothread_switch(cothread_state *thread) {
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cothread_context *ctx;
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cothread_state *current;
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int enter;
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// int i;
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//
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DEBUG("thread = %p\n", thread);
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if (thread == NULL)
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return;
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DEBUG("ctx = %p\n", ctx);
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ctx = thread->ctx;
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DEBUG("ctx->threads = %p\n", ctx->threads);
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current = ctx->threads[ctx->current];
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DEBUG("ctx->current = %d\n", ctx->current);
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DEBUG("current->threadnum = %d\n", current->threadnum);
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DEBUG("current = %p\n", current);
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if (current == NULL) {
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g_print("cothread: there's no current thread, help!\n");
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exit(2);
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}
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/*
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if (current == thread) {
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g_print("cothread: trying to switch to same thread, legal but not necessary\n");
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//return;
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}
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*/
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// find the number of the thread to switch to
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ctx->current = thread->threadnum;
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DEBUG("cothread: about to switch to thread #%d\n",ctx->current);
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/* save the current stack pointer, frame pointer, and pc */
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GET_SP(current->sp);
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enter = setjmp(current->jmp);
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DEBUG("cothread: SP is %p\n", current->sp);
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DEBUG("cothread: after thread #%d %d\n",ctx->current, enter);
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if (enter != 0) {
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return;
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}
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enter = 1;
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DEBUG("cothread: set stack to %p\n", thread->sp);
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/* restore stack pointer and other stuff of new cothread */
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if (thread->flags & COTHREAD_STARTED) {
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void *temp1, *temp2;
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DEBUG("cothread: in thread \n");
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GET_SP(temp1);
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SET_SP(thread->sp);
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GET_SP(temp2);
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DEBUG("SP %p -> %p\n", temp1, temp2);
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// switch to it
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longjmp(thread->jmp,1);
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} else {
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void *temp1, *temp2;
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SETUP_STACK(thread->sp);
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GET_SP(temp1);
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SET_SP(thread->sp);
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GET_SP(temp2);
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DEBUG("thead[2].num = %d\n", ctx->threads[2]->threadnum);
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DEBUG("SP %p -> %p\n", temp1, temp2);
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DEBUG("thead[2].num = %d\n", ctx->threads[2]->threadnum);
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// start it
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//JUMP(cothread_stub);
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cothread_stub();
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DEBUG("cothread: exit thread \n");
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}
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}
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@ -1,48 +0,0 @@
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#ifndef __COTHREADS_H__
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#define __COTHREADS_H__
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#include <setjmp.h>
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#include <pthread.h>
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#define COTHREAD_STACKSIZE 8192
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#define COTHREAD_MAXTHREADS 16
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#define STACK_SIZE 0x200000
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#ifndef CURRENT_STACK_FRAME
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#define CURRENT_STACK_FRAME ({ char __csf; &__csf; })
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#endif /* CURRENT_STACK_FRAME */
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typedef struct _cothread_state cothread_state;
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typedef struct _cothread_context cothread_context;
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typedef int (*cothread_func)(int argc,char **argv);
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#define COTHREAD_STARTED 0x01
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struct _cothread_state {
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cothread_context *ctx;
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int threadnum;
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cothread_func func;
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int argc;
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char **argv;
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int flags;
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int *sp;
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int *pc;
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jmp_buf jmp;
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};
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struct _cothread_context {
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cothread_state *threads[COTHREAD_MAXTHREADS];
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int nthreads;
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int current;
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};
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cothread_context *cothread_init();
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cothread_state *cothread_create(cothread_context *ctx);
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void cothread_setfunc(cothread_state *thread,cothread_func func,int argc,char **argv);
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void cothread_switch(cothread_state *thread);
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cothread_state *cothread_main(cothread_context *ctx);
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#endif /* __COTHREAD_H__ */
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