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Diffstat (limited to 'include/my_context.h')
| -rw-r--r-- | include/my_context.h | 232 |
1 files changed, 0 insertions, 232 deletions
diff --git a/include/my_context.h b/include/my_context.h deleted file mode 100644 index ea0e3496887..00000000000 --- a/include/my_context.h +++ /dev/null @@ -1,232 +0,0 @@ -/* - Copyright 2011 Kristian Nielsen and Monty Program Ab - - This file 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 2.1 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 General Public License - along with this. If not, see <http://www.gnu.org/licenses/>. -*/ - -/* - Simple API for spawning a co-routine, to be used for async libmysqlclient. - - Idea is that by implementing this interface using whatever facilities are - available for given platform, we can use the same code for the generic - libmysqlclient-async code. - - (This particular implementation uses Posix ucontext swapcontext().) -*/ - -#ifdef __WIN__ -#define MY_CONTEXT_USE_WIN32_FIBERS 1 -#elif defined(__GNUC__) && __GNUC__ >= 3 && defined(__x86_64__) && !defined(__ILP32__) -#define MY_CONTEXT_USE_X86_64_GCC_ASM -#elif defined(__GNUC__) && __GNUC__ >= 3 && defined(__i386__) -#define MY_CONTEXT_USE_I386_GCC_ASM -#elif defined(HAVE_UCONTEXT_H) -#define MY_CONTEXT_USE_UCONTEXT -#else -#define MY_CONTEXT_DISABLE -#endif - -#ifdef MY_CONTEXT_USE_WIN32_FIBERS -struct my_context { - void (*user_func)(void *); - void *user_arg; - void *app_fiber; - void *lib_fiber; - int return_value; -#ifndef DBUG_OFF - void *dbug_state; -#endif -}; -#endif - - -#ifdef MY_CONTEXT_USE_UCONTEXT -#include <ucontext.h> - -struct my_context { - void (*user_func)(void *); - void *user_data; - void *stack; - size_t stack_size; - ucontext_t base_context; - ucontext_t spawned_context; - int active; -#ifdef HAVE_VALGRIND_MEMCHECK_H - unsigned int valgrind_stack_id; -#endif -#ifndef DBUG_OFF - void *dbug_state; -#endif -}; -#endif - - -#ifdef MY_CONTEXT_USE_X86_64_GCC_ASM -#include <stdint.h> - -struct my_context { - uint64_t save[9]; - void *stack_top; - void *stack_bot; -#ifdef HAVE_VALGRIND_MEMCHECK_H - unsigned int valgrind_stack_id; -#endif -#ifndef DBUG_OFF - void *dbug_state; -#endif -}; -#endif - - -#ifdef MY_CONTEXT_USE_I386_GCC_ASM -#include <stdint.h> - -struct my_context { - uint64_t save[7]; - void *stack_top; - void *stack_bot; -#ifdef HAVE_VALGRIND_MEMCHECK_H - unsigned int valgrind_stack_id; -#endif -#ifndef DBUG_OFF - void *dbug_state; -#endif -}; -#endif - - -#ifdef MY_CONTEXT_DISABLE -struct my_context { - int dummy; -}; -#endif - - -/* - Initialize an asynchroneous context object. - Returns 0 on success, non-zero on failure. -*/ -extern int my_context_init(struct my_context *c, size_t stack_size); - -/* Free an asynchroneous context object, deallocating any resources used. */ -extern void my_context_destroy(struct my_context *c); - -/* - Spawn an asynchroneous context. The context will run the supplied user - function, passing the supplied user data pointer. - - The context must have been initialised with my_context_init() prior to - this call. - - The user function may call my_context_yield(), which will cause this - function to return 1. Then later my_context_continue() may be called, which - will resume the asynchroneous context by returning from the previous - my_context_yield() call. - - When the user function returns, this function returns 0. - - In case of error, -1 is returned. -*/ -extern int my_context_spawn(struct my_context *c, void (*f)(void *), void *d); - -/* - Suspend an asynchroneous context started with my_context_spawn. - - When my_context_yield() is called, execution immediately returns from the - last my_context_spawn() or my_context_continue() call. Then when later - my_context_continue() is called, execution resumes by returning from this - my_context_yield() call. - - Returns 0 if ok, -1 in case of error. -*/ -extern int my_context_yield(struct my_context *c); - -/* - Resume an asynchroneous context. The context was spawned by - my_context_spawn(), and later suspended inside my_context_yield(). - - The asynchroneous context may be repeatedly suspended with - my_context_yield() and resumed with my_context_continue(). - - Each time it is suspended, this function returns 1. When the originally - spawned user function returns, this function returns 0. - - In case of error, -1 is returned. -*/ -extern int my_context_continue(struct my_context *c); - - -struct mysql_async_context { - /* - This is set to the value that should be returned from foo_start() or - foo_cont() when a call is suspended. - */ - unsigned int events_to_wait_for; - /* - It is also set to the event(s) that triggered when a suspended call is - resumed, eg. whether we woke up due to connection completed or timeout - in mysql_real_connect_cont(). - */ - unsigned int events_occurred; - /* - This is set to the result of the whole asynchronous operation when it - completes. It uses a union, as different calls have different return - types. - */ - union { - void *r_ptr; - const void *r_const_ptr; - int r_int; - my_bool r_my_bool; - } ret_result; - /* - The timeout value (in millisecods), for suspended calls that need to wake - up on a timeout (eg. mysql_real_connect_start(). - */ - unsigned int timeout_value; - /* - This flag is set when we are executing inside some asynchronous call - foo_start() or foo_cont(). It is used to decide whether to use the - synchronous or asynchronous version of calls that may block such as - recv(). - - Note that this flag is not set when a call is suspended, eg. after - returning from foo_start() and before re-entering foo_cont(). - */ - my_bool active; - /* - This flag is set when an asynchronous operation is in progress, but - suspended. Ie. it is set when foo_start() or foo_cont() returns because - the operation needs to block, suspending the operation. - - It is used to give an error (rather than crash) if the application - attempts to call some foo_cont() method when no suspended operation foo is - in progress. - */ - my_bool suspended; - /* - If non-NULL, this is a pointer to a callback hook that will be invoked with - the user data argument just before the context is suspended, and just after - it is resumed. - */ - void (*suspend_resume_hook)(my_bool suspend, void *user_data); - void *suspend_resume_hook_user_data; - /* - This is used to save the execution contexts so that we can suspend an - operation and switch back to the application context, to resume the - suspended context later when the application re-invokes us with - foo_cont(). - */ - struct my_context async_context; -}; |