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MWL#192: Non-blocking client API for libmysqlclient.

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All client functions that can block on I/O have alternate _start() and
_cont() versions that do not block but return control back to the
application, which can then issue I/O wait in its own fashion and later
call back into the library to continue the operation.

Works behind the scenes by spawning a co-routine/fiber to run the
blocking operation and suspend it while waiting for I/O. This
co-routine/fiber use is invisible to applications.

For i368/x86_64 on GCC, uses very fast assembler co-routine support. On
Windows uses native Win32 Fibers. Falls back to POSIX ucontext on other
platforms. Assembler routines for more platforms are relatively easy to
add by extending mysys/my_context.c, eg. similar to the Lua lcoco
library.

For testing, mysqltest and mysql_client_test are extended with the
option --non-blocking-api. This causes the programs to use the
non-blocking API for database access. mysql-test-run.pl has a similar
option --non-blocking-api that uses this, as well as additional
testcases.

An example program tests/async_queries.c is included that uses the new
non-blocking API with libevent to show how, in a single-threaded
program, to issue many queries in parallel against a database.


client/async_example.c:
  Fix const warning
  ******
  Fix bug with wrong timeout value for poll().
include/Makefile.am:
  Fix missing include for `make dist`
include/mysql.h:
  Add prototypes for all non-blocking API calls.
include/mysql.h.pp:
  Add prototypes for all non-blocking API calls.
mysys/my_context.c:
  Fix type warning for makecontext() function pointer argument.
sql-common/mysql_async.c:
  Fix crashes in the non-blocking API for functions that can take MYSQL argument
  that is NULL.
tests/Makefile.am:
  Add header file to `make dist`
tests/mysql_client_test.c:
  Replace blocking calls with wrappers around the non-blocking calls, used in
  mysql_client_test to test the new non-blocking API.
tests/nonblock-wrappers.h:
  Replace blocking calls with wrappers around the non-blocking calls, used in
  mysql_client_test to test the new non-blocking API.
This commit is contained in:
unknown
2011-09-20 12:49:25 +02:00
parent 1a344b87e4
commit a5b881594d
41 changed files with 4389 additions and 38 deletions
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11
include/sql_common.h
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@@ -26,11 +26,18 @@ extern const char *unknown_sqlstate;
extern const char *cant_connect_sqlstate;
extern const char *not_error_sqlstate;
struct mysql_async_context;
struct st_mysql_options_extention {
char *plugin_dir;
char *default_auth;
};
struct st_mysql_extension {
struct mysql_async_context *async_context;
};
typedef struct st_mysql_methods
{
my_bool (*read_query_result)(MYSQL *mysql);
@@ -102,6 +109,10 @@ void mysql_client_plugin_deinit();
struct st_mysql_client_plugin;
extern struct st_mysql_client_plugin *mysql_client_builtins[];
/* Non-blocking client API. */
void my_context_install_suspend_resume_hook(struct mysql_async_context *b,
void (*)(my_bool, void *), void *);
#ifdef __cplusplus
}
#endif