test.c

/*  Test code for ipc.h header-only library
    no warranty implied; use at your own risk

    by Jari Komppa, http://iki.fi/sol/

LICENSE

    This is free and unencumbered software released into the public domain.

    Anyone is free to copy, modify, publish, use, compile, sell, or
    distribute this software, either in source code form or as a compiled
    binary, for any purpose, commercial or non-commercial, and by any
    means.

    In jurisdictions that recognize copyright laws, the author or authors
    of this software dedicate any and all copyright interest in the
    software to the public domain. We make this dedication for the benefit
    of the public at large and to the detriment of our heirs and
    successors. We intend this dedication to be an overt act of
    relinquishment in perpetuity of all present and future rights to this
    software under copyright law.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
    IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
    OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
    ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
    OTHER DEALINGS IN THE SOFTWARE.

    For more information, please refer to <http://unlicense.org/>
*/

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define IPC_IMPLEMENTATION
#include "ipc.h"

#if defined(_WIN32)
int myprocessid()
{
    return GetCurrentProcessId();
}
#else
#include <unistd.h>
int myprocessid()
{
    return getpid();
}
#endif

#define WORKUNITS 1024
#define WORKUNITSIZE (64*64)
#define TOTALSIZE WORKUNITS+WORKUNITS*WORKUNITSIZE+1

ipc_sharedsemaphore coop;
ipc_sharedmemory mem;
int pid;

int busywork(int seed)
{
    double xx, yy, x0, y0, s;
    int n;
    xx = (seed % WORKUNITSIZE) / (double)WORKUNITSIZE;
    yy = (seed / WORKUNITSIZE) / (double)WORKUNITSIZE;
    x0 = xx;
    y0 = yy;
    n = 1;
    do
    {
        double x1, y1;
        n++;
        x1 = x0 * x0;
        y1 = y0 * y0;
        y0 = (x0 * y0) * 2 + yy;
        x0 = x1 - y1 + xx;
        s = x1 + y1;
    } while ((s < 4) && (n < 1000));
    return n;
}

int main(int parc, char **pars)
{
    int done = 0;
    int first = 0;

    pid = myprocessid();

    printf("%08x: Starting\n", pid);

    ipc_sem_init(&coop, "ipc_test_semaphore");
    ipc_mem_init(&mem, "ipc_test_memory", TOTALSIZE);

    if (ipc_sem_create(&coop, 1))
    {
        printf("%08x: ipc_sem_create failed\n", pid);
        return -1;
    }

    // Grab semaphore
    ipc_sem_decrement(&coop);

    if (ipc_mem_open_existing(&mem))
    {
        printf("%08x: Opening existing memory failed, maybe we're first?\n", pid);
        if (ipc_mem_create(&mem))
        {
            printf("%08x: Creating memory failed.\n", pid);
            return -1;
        }
        printf("%08x: Seems we're the first. Initializing work memory.\n", pid);
        memset(mem.data, 0, mem.size);
        first = 1;
    }
    else
    {
        printf("%08x: We're not the first.\n", pid);
    }

    // let's clock in
    mem.data[0]++;

    // release semaphore before the main loop
    ipc_sem_increment(&coop);

    while (!done)
    {
        int i, work = -1;

        // Grab semaphore
        ipc_sem_decrement(&coop);
        printf("%08x: Looking for work.\n", pid);
        for (i = 0; work == -1 && i < WORKUNITS; i++)
        {
            if (mem.data[i + 1] == 0)
            {
                printf("%08x: Taking work unit %d.\n", pid, i);
                mem.data[i + 1] += 1;
                work = i;
            }
        }
        // Let someone else work
        ipc_sem_increment(&coop);
        if (work != -1)
        {
            // do "work"
            for (i = 0; i < WORKUNITSIZE; i++)
                mem.data[WORKUNITS + work * WORKUNITSIZE + i + 1] += busywork(work * WORKUNITSIZE + i);
        }
        else
        {
            printf("%08x: No work found, I guess we're done.\n", pid);
            done = 1;
        }
    }

    // Grab semaphore
    ipc_sem_decrement(&coop);

    // clock out
    mem.data[0]--;

    // Let someone else work
    ipc_sem_increment(&coop);

    if (first)
    {
        FILE *f;
        printf("%08x: Since we're the first, let's dump the work memory for diagnostics purposes\n", pid);
        if (mem.data[0] > 0)
        {
            printf("%08x: oops, someone else is still working..\n", pid);
            while (mem.data[0] > 0)
            {
                busywork(0xc0cac01a);
            }
            printf("%08x: they're done now I guess.\n", pid);
        }
        f = fopen("dump.dat", "wb");
        fwrite(mem.data, 1, mem.size, f);
        fclose(f);
        printf("%08x: dump.dat written.\n", pid);
    }

    ipc_mem_close(&mem);
    ipc_sem_close(&coop);

    printf("%08x: Done.\n", pid);
    return 0;
}