stasis-aries-wal/test/stasis/fault_injection/fisubject.c

/*---
This software is copyrighted by the Regents of the University of
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associated with the software unless explicitly disclaimed in
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each file where they apply.
                                                                                                                                 
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POSSIBILITY OF SUCH DAMAGE.
                                                                                                                                  
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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the software and related documentation as defined in the Federal
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---*/


#include "fitest.h"
#include <limits.h>

#define BUFFER_INITIAL_LENGTH 256

recordid hashTable;
int insertLog, commitLog;
pthread_mutex_t hashTableMutex;

int numMallocs    = 0;
int numLogWrites  = 0;
int numPageWrites = 0;

int initHashTable;

static void* threadFunc(void* arg_ptr);
static void  writeKeyToBuffer(char** insertBuffer, int* bufferCurrentLength, 
			      int* bufferTotalSize, int key);
static void  writeBufferToLog(int log, char* insertBuffer, int bufferCurrentLength);

int
runSubject() {
  pthread_t* threads;
  pthread_attr_t attr;
  intptr_t k;
  int xid, fd;

  /* Need the following sleep call for debugging. */
  //sleep(45);

  printf("\tRunning Subject Process\n"); fflush(stdout);

  readGlobalsFromSharedBuffer();

  initHashTable = 1;

  Tinit();
  
  if (iteration == 0) {
    /* Create the transactional hash table data structure. */
    xid = Tbegin();
    hashTable = ThashCreate(xid, sizeof(int), sizeof(int));
    Tcommit(xid);

    /* Write the hash table recordid to a file, so it can be 
     * reloaded during subsequent iterations.
     */
    fd = open("recordid.txt", O_CREAT | O_WRONLY | O_SYNC, 0777);
    write(fd, (char*) &hashTable, sizeof(recordid));
    close(fd);
  }
  else {
    /* Otherwise, read in the hash table from disk. */
    fd = open("recordid.txt", O_RDONLY, 0777);
    read(fd, (char*) &hashTable, sizeof(recordid));
    close(fd);
  }

  initHashTable = 0;
  
  /* Open the insert and commit log files. The insert-log keeps track of all insertions
   * that were made to the hash-table, not all of which may have been committed.  The
   * commit-log keeps track of all insertions that were definitely committed.
   */
  insertLog = open("inserts.txt", O_CREAT | O_RDWR | O_APPEND, 0777);
  commitLog = open("commits.txt", O_CREAT | O_RDWR | O_APPEND, 0777);

  /* Allocate the worker threads. */
  threads = stasis_malloc(numThreads, pthread_t);
  
  pthread_attr_init(&attr);
  pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN);

  pthread_mutex_init(&hashTableMutex, NULL);

  for (k = 0; k < numThreads; k++) {
    pthread_create(&threads[k], &attr, threadFunc, (void*) k);
  }
  
  for (k = 0; k < numThreads; k++) {
    pthread_join(threads[k], NULL);
  }

  /* Close the insert and commit log files. */
  close(insertLog);
  close(commitLog);
  
  Tdeinit();

  printf("\t\tSubject Process Exiting Normally\n"); fflush(stdout);

  return 0;
}

static void* 
threadFunc(void* arg_ptr) {
  int j, k, startKey, endKey;
  int xid, count = 0;
  int bufferCurrentLength, bufferTotalSize;
  char* insertBuffer;

  /* Allocate the buffer that stores all outstanding hash table insertions. */
  bufferTotalSize = BUFFER_INITIAL_LENGTH;
  bufferCurrentLength = 0;
  insertBuffer = stasis_malloc(bufferTotalSize, char);

  xid = Tbegin();
  
  k = (intptr_t) arg_ptr;

  startKey = baseKey + (k * opsPerThread);
  endKey   = startKey + opsPerThread;

  for (j = startKey; j < endKey; j++) {
    ThashInsert(xid, hashTable, (byte*)&j, sizeof(int), (byte*)&j, sizeof(int));
    writeKeyToBuffer(&insertBuffer, &bufferCurrentLength, &bufferTotalSize, j);
    count++;
    
    if ((count % opsPerTransaction) == 0) {
      /* Prior to committing the transaction, write the hash table insertion buffer to 
       * the insert-log so that we can keep track of which insertions were possibly 
       * committed.  After the Tcommit() call, write the insertion buffer to the commit-
       * log so that we can keep track of which insertions were definitely committed.
       */
      writeBufferToLog(insertLog, insertBuffer, bufferCurrentLength);
      Tcommit(xid);
      writeBufferToLog(commitLog, insertBuffer, bufferCurrentLength);
      bufferCurrentLength = 0;

      xid = Tbegin();
      count = 0;
    }
  }

  /* Prior to committing the transaction, write the hash table insertion buffer to 
   * the insert-log so that we can keep track of which insertions were possibly 
   * committed.  After the Tcommit() call, write the insertion buffer to the commit-
   * log so that we can keep track of which insertions were definitely committed.
   */
  writeBufferToLog(insertLog, insertBuffer, bufferCurrentLength);
  Tcommit(xid);
  writeBufferToLog(commitLog, insertBuffer, bufferCurrentLength);
  
  return NULL;
}

static void  
writeKeyToBuffer(char** insertBuffer, int* bufferCurrentLength, 
		 int* bufferTotalSize, int key) {
  int curLength, totalSize, bytesWritten;

  curLength = *bufferCurrentLength;
  totalSize = *bufferTotalSize;

  /* Assume we need a maximum of 15 characters for the key, including the terminating
   * newline and null character.  Realloc if there's not enough space in the buffer.
   */
  if ((curLength + 15) > totalSize) {
    totalSize *= 2;
    *insertBuffer = (char*) realloc(*insertBuffer, totalSize);
    *bufferTotalSize = totalSize;
  }

  bytesWritten = sprintf(*insertBuffer + curLength, "%d\n", key);
  curLength += bytesWritten;
  assert(curLength < totalSize);

  *bufferCurrentLength = curLength;
}

static void  
writeBufferToLog(int log, char* insertBuffer, int bufferCurrentLength) {
  pthread_mutex_lock(&hashTableMutex);
  write(log, insertBuffer, bufferCurrentLength);
  //fsync(log);
  pthread_mutex_unlock(&hashTableMutex);
}


/* The following prototypes are needed to suppress GCC warnings. */
void*   __real_malloc(int c);
size_t  __real_fwrite(const void *ptr, size_t size, size_t nitems, FILE *stream);
ssize_t __real_pwrite(int fildes, const void *buf, size_t nbyte, __off64_t offset);
ssize_t __real_pwrite64(int fildes, const void *buf, size_t nbyte, __off64_t offset);

void*
__wrap_malloc(size_t size) {
  /* fprintf(stderr, "inside wrapper function for malloc\n"); */

  if (!mallocsBeforeFailure || currentMode != SUBJECT_MODE || initHashTable) {
    return __real_malloc(size);
  }

  pthread_mutex_lock(&hashTableMutex);
  numMallocs++;
    
  if (numMallocs >= mallocsBeforeFailure) {
    printf("\t\tMALLOC FAILURE:  Subject Process Exiting Prematurely\n"); fflush(stdout);
    
    /* Exit the process. */
    exit(1);
  }
    
  pthread_mutex_unlock(&hashTableMutex);

  return __real_malloc(size);
}

size_t 
__wrap_fwrite(const void *ptr, size_t size, size_t nitems, FILE *stream) {
  int updatedSize;

  /* fprintf(stderr, "inside wrapper function for fwrite\n"); */

  if (!logWritesBeforeFailure || currentMode != SUBJECT_MODE || initHashTable) {
    return __real_fwrite(ptr, size, nitems, stream);
  }

  pthread_mutex_lock(&hashTableMutex);
  numLogWrites++;
  
  if (numLogWrites >= logWritesBeforeFailure) {
    printf("\t\tFWRITE FAILURE:  Subject Process Exiting Prematurely\n"); fflush(stdout);
    
    /* Possibly write a percentage of the buffer, to simulate the writing of a torn log. */
    if (logWriteAmountDuringFailure > 0) {
      updatedSize = (int) ((nitems * logWriteAmountDuringFailure) / 100.0);
      __real_fwrite(ptr, size, updatedSize, stream);
    }

    /* Exit the process. */
    exit(1);
  }
  
  pthread_mutex_unlock(&hashTableMutex);

  return __real_fwrite(ptr, size, nitems, stream);
}

ssize_t 
__wrap_pwrite(int fildes, const void *buf, size_t nbyte, __off64_t offset) {
  int updatedSize;

  /* fprintf(stderr, "inside wrapper function for pwrite64\n"); */

  if (!pageWritesBeforeFailure || currentMode != SUBJECT_MODE || initHashTable) {
    return __real_pwrite(fildes, buf, nbyte, offset);
  }

  pthread_mutex_lock(&hashTableMutex);
  numPageWrites++;
      
  if (numPageWrites >= pageWritesBeforeFailure) {
    printf("\t\tPWRITE FAILURE:  Subject Process Exiting Prematurely\n"); fflush(stdout);
    
    /* Possibly write a percentage of the buffer, to simulate the writing of a torn page. */
    if (pageWriteAmountDuringFailure > 0) {
      updatedSize = (int) ((nbyte * pageWriteAmountDuringFailure) / 100.0);
      __real_pwrite64(fildes, buf, updatedSize, offset);
    }
    
    /* Exit the process. */
    exit(1);
  }
      
  pthread_mutex_unlock(&hashTableMutex);

  return __real_pwrite(fildes, buf, nbyte, offset);
}

ssize_t 
__wrap_pwrite64(int fildes, const void *buf, size_t nbyte, __off64_t offset) {
  int updatedSize;

  /* fprintf(stderr, "inside wrapper function for pwrite64\n"); */

  if (!pageWritesBeforeFailure || currentMode != SUBJECT_MODE || initHashTable) {
    return __real_pwrite64(fildes, buf, nbyte, offset);
  }

  pthread_mutex_lock(&hashTableMutex);
  numPageWrites++;
  
  if (numPageWrites >= pageWritesBeforeFailure) {
    printf("\t\tPWRITE64 FAILURE:  Subject Process Exiting Prematurely\n"); fflush(stdout);
    
    /* Possibly write a percentage of the buffer, to simulate the writing of a torn page. */
    if (pageWriteAmountDuringFailure > 0) {
      updatedSize = (int) ((nbyte * pageWriteAmountDuringFailure) / 100.0);
      __real_pwrite64(fildes, buf, updatedSize, offset);
    }
    
    /* Exit the process. */
    exit(1);
  }
  
  pthread_mutex_unlock(&hashTableMutex);

  return __real_pwrite64(fildes, buf, nbyte, offset);
}