From 6860968c3adaf2e8c3cb51124bbdfccef74beeb9 Mon Sep 17 00:00:00 2001 From: Kaleb S KEITHLEY Date: Thu, 18 Feb 2016 11:21:12 -0500 Subject: qemu-block: deprecated/defunct, remove from tree qemu-block xlator is not used by anyone, or so I'm told. It's also substantially out of date. There's little reason to keep it in our sources. (And FedoraProject doesn't like bundled software either.) Change-Id: I4aeb2fdfd962ec6d93de6bae126874121272220a Signed-off-by: Kaleb S KEITHLEY Reviewed-on: http://review.gluster.org/13473 Smoke: Gluster Build System CentOS-regression: Gluster Build System NetBSD-regression: NetBSD Build System Reviewed-by: Shyamsundar Ranganathan Reviewed-by: Jeff Darcy --- contrib/qemu/coroutine-ucontext.c | 225 -------------------------------------- 1 file changed, 225 deletions(-) delete mode 100644 contrib/qemu/coroutine-ucontext.c (limited to 'contrib/qemu/coroutine-ucontext.c') diff --git a/contrib/qemu/coroutine-ucontext.c b/contrib/qemu/coroutine-ucontext.c deleted file mode 100644 index 4bf2cde279b..00000000000 --- a/contrib/qemu/coroutine-ucontext.c +++ /dev/null @@ -1,225 +0,0 @@ -/* - * ucontext coroutine initialization code - * - * Copyright (C) 2006 Anthony Liguori - * Copyright (C) 2011 Kevin Wolf - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.0 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 - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, see . - */ - -/* XXX Is there a nicer way to disable glibc's stack check for longjmp? */ -#ifdef _FORTIFY_SOURCE -#undef _FORTIFY_SOURCE -#endif -#include -#include -#include -#include -#include -#include "qemu-common.h" -#include "block/coroutine_int.h" - -#ifdef CONFIG_VALGRIND_H -#include -#endif - -typedef struct { - Coroutine base; - void *stack; - sigjmp_buf env; - -#ifdef CONFIG_VALGRIND_H - unsigned int valgrind_stack_id; -#endif - -} CoroutineUContext; - -/** - * Per-thread coroutine bookkeeping - */ -typedef struct { - /** Currently executing coroutine */ - Coroutine *current; - - /** The default coroutine */ - CoroutineUContext leader; -} CoroutineThreadState; - -static pthread_key_t thread_state_key; - -/* - * va_args to makecontext() must be type 'int', so passing - * the pointer we need may require several int args. This - * union is a quick hack to let us do that - */ -union cc_arg { - void *p; - int i[2]; -}; - -static CoroutineThreadState *coroutine_get_thread_state(void) -{ - CoroutineThreadState *s = pthread_getspecific(thread_state_key); - - if (!s) { - s = g_malloc0(sizeof(*s)); - s->current = &s->leader.base; - pthread_setspecific(thread_state_key, s); - } - return s; -} - -static void qemu_coroutine_thread_cleanup(void *opaque) -{ - CoroutineThreadState *s = opaque; - - g_free(s); -} - -static void __attribute__((constructor)) coroutine_init(void) -{ - int ret; - - ret = pthread_key_create(&thread_state_key, qemu_coroutine_thread_cleanup); - if (ret != 0) { - fprintf(stderr, "unable to create leader key: %s\n", strerror(errno)); - abort(); - } -} - -static void coroutine_trampoline(int i0, int i1) -{ - union cc_arg arg; - CoroutineUContext *self; - Coroutine *co; - - arg.i[0] = i0; - arg.i[1] = i1; - self = arg.p; - co = &self->base; - - /* Initialize longjmp environment and switch back the caller */ - if (!sigsetjmp(self->env, 0)) { - siglongjmp(*(sigjmp_buf *)co->entry_arg, 1); - } - - while (true) { - co->entry(co->entry_arg); - qemu_coroutine_switch(co, co->caller, COROUTINE_TERMINATE); - } -} - -Coroutine *qemu_coroutine_new(void) -{ - const size_t stack_size = 1 << 20; - CoroutineUContext *co; - ucontext_t old_uc, uc; - sigjmp_buf old_env; - union cc_arg arg = {0}; - - /* The ucontext functions preserve signal masks which incurs a - * system call overhead. sigsetjmp(buf, 0)/siglongjmp() does not - * preserve signal masks but only works on the current stack. - * Since we need a way to create and switch to a new stack, use - * the ucontext functions for that but sigsetjmp()/siglongjmp() for - * everything else. - */ - - if (getcontext(&uc) == -1) { - abort(); - } - - co = g_malloc0(sizeof(*co)); - co->stack = g_malloc(stack_size); - co->base.entry_arg = &old_env; /* stash away our jmp_buf */ - - uc.uc_link = &old_uc; - uc.uc_stack.ss_sp = co->stack; - uc.uc_stack.ss_size = stack_size; - uc.uc_stack.ss_flags = 0; - -#ifdef CONFIG_VALGRIND_H - co->valgrind_stack_id = - VALGRIND_STACK_REGISTER(co->stack, co->stack + stack_size); -#endif - - arg.p = co; - - makecontext(&uc, (void (*)(void))coroutine_trampoline, - 2, arg.i[0], arg.i[1]); - - /* swapcontext() in, siglongjmp() back out */ - if (!sigsetjmp(old_env, 0)) { - swapcontext(&old_uc, &uc); - } - return &co->base; -} - -#ifdef CONFIG_VALGRIND_H -#ifdef CONFIG_PRAGMA_DIAGNOSTIC_AVAILABLE -/* Work around an unused variable in the valgrind.h macro... */ -#pragma GCC diagnostic push -#pragma GCC diagnostic ignored "-Wunused-but-set-variable" -#endif -static inline void valgrind_stack_deregister(CoroutineUContext *co) -{ - VALGRIND_STACK_DEREGISTER(co->valgrind_stack_id); -} -#ifdef CONFIG_PRAGMA_DIAGNOSTIC_AVAILABLE -#pragma GCC diagnostic pop -#endif -#endif - -void qemu_coroutine_delete(Coroutine *co_) -{ - CoroutineUContext *co = DO_UPCAST(CoroutineUContext, base, co_); - -#ifdef CONFIG_VALGRIND_H - valgrind_stack_deregister(co); -#endif - - g_free(co->stack); - g_free(co); -} - -CoroutineAction qemu_coroutine_switch(Coroutine *from_, Coroutine *to_, - CoroutineAction action) -{ - CoroutineUContext *from = DO_UPCAST(CoroutineUContext, base, from_); - CoroutineUContext *to = DO_UPCAST(CoroutineUContext, base, to_); - CoroutineThreadState *s = coroutine_get_thread_state(); - int ret; - - s->current = to_; - - ret = sigsetjmp(from->env, 0); - if (ret == 0) { - siglongjmp(to->env, action); - } - return ret; -} - -Coroutine *qemu_coroutine_self(void) -{ - CoroutineThreadState *s = coroutine_get_thread_state(); - - return s->current; -} - -bool qemu_in_coroutine(void) -{ - CoroutineThreadState *s = pthread_getspecific(thread_state_key); - - return s && s->current->caller; -} -- cgit