luasocket/src/timeout.c

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/*=========================================================================*\
* Timeout management functions
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* Global Lua functions:
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* _sleep
* _time
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*
* RCS ID: $Id$
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\*=========================================================================*/
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#include <stdio.h>
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#include <lua.h>
#include <lauxlib.h>
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#include "luasocket.h"
#include "aux.h"
#include "tm.h"
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#ifdef WIN32
#include <windows.h>
#else
#include <sys/times.h>
#include <time.h>
#include <unistd.h>
#endif
/*=========================================================================*\
* Internal function prototypes
\*=========================================================================*/
static int tm_lua_time(lua_State *L);
static int tm_lua_sleep(lua_State *L);
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static luaL_reg func[] = {
{ "time", tm_lua_time },
{ "sleep", tm_lua_sleep },
{ NULL, NULL }
};
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/*=========================================================================*\
* Exported functions.
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
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* Initialize structure
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\*-------------------------------------------------------------------------*/
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void tm_init(p_tm tm, int block, int total)
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{
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tm->block = block;
tm->total = total;
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}
/*-------------------------------------------------------------------------*\
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* Set and get timeout limits
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\*-------------------------------------------------------------------------*/
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void tm_setblock(p_tm tm, int block)
{ tm->block = block; }
void tm_settotal(p_tm tm, int total)
{ tm->total = total; }
int tm_getblock(p_tm tm)
{ return tm->block; }
int tm_gettotal(p_tm tm)
{ return tm->total; }
int tm_getstart(p_tm tm)
{ return tm->start; }
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/*-------------------------------------------------------------------------*\
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* Determines how much time we have left for the current operation
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* Input
* tm: timeout control structure
* Returns
* the number of ms left or -1 if there is no time limit
\*-------------------------------------------------------------------------*/
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int tm_get(p_tm tm)
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{
/* no timeout */
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if (tm->block < 0 && tm->total < 0)
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return -1;
/* there is no block timeout, we use the return timeout */
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else if (tm->block < 0)
return MAX(tm->total - tm_gettime() + tm->start, 0);
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/* there is no return timeout, we use the block timeout */
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else if (tm->total < 0)
return tm->block;
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/* both timeouts are specified */
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else return MIN(tm->block,
MAX(tm->total - tm_gettime() + tm->start, 0));
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}
/*-------------------------------------------------------------------------*\
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* Marks the operation start time in structure
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* Input
* tm: timeout control structure
\*-------------------------------------------------------------------------*/
void tm_markstart(p_tm tm)
{
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tm->start = tm_gettime();
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}
/*-------------------------------------------------------------------------*\
* Gets time in ms, relative to system startup.
* Returns
* time in ms.
\*-------------------------------------------------------------------------*/
#ifdef WIN32
int tm_gettime(void)
{
return GetTickCount();
}
#else
int tm_gettime(void)
{
struct tms t;
return (times(&t)*1000)/CLK_TCK;
}
#endif
/*-------------------------------------------------------------------------*\
* Initializes module
\*-------------------------------------------------------------------------*/
void tm_open(lua_State *L)
{
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luaL_openlib(L, LUASOCKET_LIBNAME, func, 0);
}
/*-------------------------------------------------------------------------*\
* Sets timeout values for IO operations
* Lua Input: base, time [, mode]
* time: time out value in seconds
* mode: "b" for block timeout, "t" for total timeout. (default: b)
\*-------------------------------------------------------------------------*/
int tm_meth_timeout(lua_State *L, p_tm tm)
{
int ms = lua_isnil(L, 2) ? -1 : (int) (luaL_checknumber(L, 2)*1000.0);
const char *mode = luaL_optstring(L, 3, "b");
switch (*mode) {
case 'b':
tm_setblock(tm, ms);
break;
case 'r': case 't':
tm_settotal(tm, ms);
break;
default:
luaL_argcheck(L, 0, 3, "invalid timeout mode");
break;
}
return 0;
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}
/*=========================================================================*\
* Test support functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Returns the time the system has been up, in secconds.
\*-------------------------------------------------------------------------*/
static int tm_lua_time(lua_State *L)
{
lua_pushnumber(L, tm_gettime()/1000.0);
return 1;
}
/*-------------------------------------------------------------------------*\
* Sleep for n seconds.
\*-------------------------------------------------------------------------*/
int tm_lua_sleep(lua_State *L)
{
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double n = luaL_checknumber(L, 1);
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#ifdef WIN32
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Sleep((int)n*1000);
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#else
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sleep((int)n);
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#endif
return 0;
}