Fossil

  db.nBegin++;
}
/*
** Begin a new transaction for writing.
*/
void db_begin_write_real(const char *zStartFile, int iStartLine){
  if( db.nBegin==0 ){
    if( !db_is_writeable("repository") ){
      db_multi_exec("BEGIN");
    }else{
      db_multi_exec("BEGIN IMMEDIATE");
      sqlite3_commit_hook(g.db, db_verify_at_commit, 0);
      db.nPriorChanges = sqlite3_total_changes(g.db);
      db.doRollback = 0;
      db.zStartFile = zStartFile;
      db.iStartLine = iStartLine;
      db.wrTxn = 1;
    }
  }else if( !db.wrTxn ){
    fossil_warning("read txn at %s:%d might cause SQLITE_BUSY "
       "for the write txn at %s:%d",
       db.zStartFile, db.iStartLine, zStartFile, iStartLine);
  }
  db.nBegin++;
}

** (N is normally a small number) and so post-receive hooks should
** probably be deferred until after the new artifacts arrive.
**
** If N==0, then there is no expectation of new artifacts arriving
** soon and so post-receive hooks can be run without delay.
*/
void hook_expecting_more_artifacts(int N){
  if( !db_is_writeable("repository") ){
    /* No-op */
  }else if( N>0 ){
    db_unprotect(PROTECT_CONFIG);
    db_multi_exec(
      "REPLACE INTO config(name,value,mtime)"
      "VALUES('hook-embargo',now()+%d,now())",
      N
    );
    db_protect_pop();