/*
   Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

#ifndef NDB_THREAD_H
#define NDB_THREAD_H

#include <ndb_global.h>

#ifdef	__cplusplus
extern "C" {
#endif

#define UNDEFINED_PROCESSOR_SET 0xFFFF

typedef enum NDB_THREAD_PRIO_ENUM {
  NDB_THREAD_PRIO_HIGHEST,
  NDB_THREAD_PRIO_HIGH,
  NDB_THREAD_PRIO_MEAN,
  NDB_THREAD_PRIO_LOW,
  NDB_THREAD_PRIO_LOWEST
} NDB_THREAD_PRIO;

typedef enum NDB_THREAD_TLS_ENUM {
  NDB_THREAD_TLS_JAM,           /* Jam buffer pointer. */
  NDB_THREAD_TLS_THREAD,        /* Thread self pointer. */
  NDB_THREAD_TLS_NDB_THREAD,    /* NDB thread pointer */
  NDB_THREAD_TLS_MAX
} NDB_THREAD_TLS;

typedef void* (NDB_THREAD_FUNC)(void*);
typedef void* NDB_THREAD_ARG;
typedef size_t NDB_THREAD_STACKSIZE;

struct NdbThread;

/*
  Method to block/unblock thread from receiving KILL signal with
  signum set in g_ndb_shm_signum in a portable manner.
*/
#ifdef NDB_SHM_TRANSPORTER
void NdbThread_set_shm_sigmask(my_bool block);
#endif

/**
 * Create a thread
 *
 *  * p_thread_func: pointer of the function to run in the thread
 *  * p_thread_arg: pointer to argument to be passed to the thread 
 *  * thread_stack_size: stack size for this thread, 0 => default size
 *  * p_thread_name: pointer to name of this thread
 *  * returnvalue: pointer to the created thread
 */
struct NdbThread* NdbThread_Create(NDB_THREAD_FUNC *p_thread_func,
                                   NDB_THREAD_ARG *p_thread_arg,
                                   const NDB_THREAD_STACKSIZE thread_stack_size,
                                   const char* p_thread_name,
                                   NDB_THREAD_PRIO thread_prio);


/**
 * Create a thread-object for "main" that can be used with
 *   other NdbThread_*-functions
 */
struct NdbThread* NdbThread_CreateObject(const char * name);

/**
 * Destroy a thread
 *  Deallocates memory for thread
 *  And NULL the pointer
 *
 */
void NdbThread_Destroy(struct NdbThread** p_thread);
 
/**
 * Waitfor a thread, suspend the execution of the calling thread
 * until the wait_thread_id completes
 *
 * * p_wait_thread, pointer to the thread to wait for
 * * status: exit code from thread waited for
 * * returnvalue: true = succeded, false = failed
 */
int NdbThread_WaitFor(struct NdbThread* p_wait_thread, void** status);      

/**
 * Exit thread, terminates the calling thread 
 *   
 * *  status: exit code
 */
void NdbThread_Exit(void *status);

/**
 * Set thread concurrency level
 *   
 * *  
 */
int NdbThread_SetConcurrencyLevel(int level);

/**
 * Get "Tid" for thread
 *   should only be used for printing etc...
 *   return -1, if not supported on platform
 */
int NdbThread_GetTid(struct NdbThread*);

/**
 * Yield to normal time-share prio and back to real-time prio for
 * real-time threads
 */
int NdbThread_yield_rt(struct NdbThread*, my_bool high_prio);

/**
 * Set Scheduler for thread
 */
int NdbThread_SetScheduler(struct NdbThread*, my_bool rt_prio, my_bool high_prio);

/**
 * Lock/Unlock Thread to CPU
 */
struct NdbCpuSet;
struct processor_set_handler;

int NdbThread_LockCreateCPUSet(const Uint32 *cpu_ids,
                               Uint32 num_cpus,
                               struct NdbCpuSet **cpu_set);
void NdbThread_LockDestroyCPUSet(struct NdbCpuSet *cpu_set);
int NdbThread_LockCPUSet(struct NdbThread*,
                         struct NdbCpuSet *cpu_set,
                         const struct processor_set_handler *cpu_set_key);
int NdbThread_LockCPU(struct NdbThread*,
                      Uint32 cpu,
                      const struct processor_set_handler *cpu_set_key);
int NdbThread_UnlockCPU(struct NdbThread*);
const struct processor_set_handler*
  NdbThread_LockGetCPUSetKey(struct NdbThread*);

/**
 * Fetch and set thread-local storage entry.
 */
void *NdbThread_GetTlsKey(NDB_THREAD_TLS key);
void NdbThread_SetTlsKey(NDB_THREAD_TLS key, void *value);
/* Get my own NdbThread pointer */
struct NdbThread *NdbThread_GetNdbThread();

/**
 * Set properties for NDB_THREAD_PRIO_HIGH
 *
 * NOTE 1: should be set *prior* to starting thread
 * NOTE 2: if these properties *can* be applied is not checked
 *         if they can not, then it will be silently ignored
 *
 * @param spec <fifo | rr>[,<prio>]
 *
 * @return 0  - parse ok
 *  return -1 - Invalid spec
 */
int NdbThread_SetHighPrioProperties(const char * spec);

#ifdef	__cplusplus
}
#endif

#endif
