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151 lines
4.4 KiB
C
151 lines
4.4 KiB
C
/******************************************************
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The interface to the operating system
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process and thread control primitives
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(c) 1995 Innobase Oy
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Created 9/8/1995 Heikki Tuuri
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*******************************************************/
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#ifndef os0thread_h
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#define os0thread_h
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#include "univ.i"
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/* Maximum number of threads which can be created in the program;
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this is also the size of the wait slot array for MySQL threads which
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can wait inside InnoDB */
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#if defined(__WIN__) || defined(__NETWARE__)
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/* Create less event semaphores because Win 98/ME had difficult creating
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40000 event semaphores */
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/* TODO: these just take a lot of memory on NetWare. should netware move up? */
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#define OS_THREAD_MAX_N 1000
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#else
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#define OS_THREAD_MAX_N 10000
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#endif
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/* Possible fixed priorities for threads */
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#define OS_THREAD_PRIORITY_NONE 100
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#define OS_THREAD_PRIORITY_BACKGROUND 1
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#define OS_THREAD_PRIORITY_NORMAL 2
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#define OS_THREAD_PRIORITY_ABOVE_NORMAL 3
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#ifdef __WIN__
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typedef void* os_thread_t;
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typedef ulint os_thread_id_t; /* In Windows the thread id
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is an unsigned long int */
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#else
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typedef pthread_t os_thread_t;
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typedef os_thread_t os_thread_id_t; /* In Unix we use the thread
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handle itself as the id of
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the thread */
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#endif
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/* Define a function pointer type to use in a typecast */
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typedef void* (*os_posix_f_t) (void*);
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/*******************************************************************
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Compares two thread ids for equality. */
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ibool
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os_thread_eq(
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/*=========*/
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/* out: TRUE if equal */
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os_thread_id_t a, /* in: OS thread or thread id */
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os_thread_id_t b); /* in: OS thread or thread id */
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/********************************************************************
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Converts an OS thread id to a ulint. It is NOT guaranteed that the ulint is
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unique for the thread though! */
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ulint
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os_thread_pf(
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/*=========*/
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/* out: unsigned long int */
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os_thread_id_t a); /* in: thread or thread id */
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/********************************************************************
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Creates a new thread of execution. The execution starts from
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the function given. The start function takes a void* parameter
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and returns a ulint. */
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os_thread_t
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os_thread_create(
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/*=============*/
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/* out: handle to the thread */
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#ifndef __WIN__
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os_posix_f_t start_f,
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#else
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ulint (*start_f)(void*), /* in: pointer to function
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from which to start */
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#endif
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void* arg, /* in: argument to start
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function */
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os_thread_id_t* thread_id); /* out: id of the created
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thread */
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/*********************************************************************
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Exits the current thread. */
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void
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os_thread_exit(
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/*===========*/
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void* exit_value); /* in: exit value; in Windows this void*
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is cast as a DWORD */
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/*********************************************************************
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Returns the thread identifier of current thread. */
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os_thread_id_t
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os_thread_get_curr_id(void);
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/*========================*/
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/*********************************************************************
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Returns handle to the current thread. */
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os_thread_t
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os_thread_get_curr(void);
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/*====================*/
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/*********************************************************************
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Waits for a thread to terminate. */
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void
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os_thread_wait(
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/*===========*/
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os_thread_t thread); /* in: thread to wait */
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/*********************************************************************
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Advises the os to give up remainder of the thread's time slice. */
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void
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os_thread_yield(void);
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/*=================*/
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/*********************************************************************
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The thread sleeps at least the time given in microseconds. */
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void
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os_thread_sleep(
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/*============*/
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ulint tm); /* in: time in microseconds */
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/**********************************************************************
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Gets a thread priority. */
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ulint
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os_thread_get_priority(
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/*===================*/
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/* out: priority */
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os_thread_t handle);/* in: OS handle to the thread */
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/**********************************************************************
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Sets a thread priority. */
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void
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os_thread_set_priority(
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/*===================*/
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os_thread_t handle, /* in: OS handle to the thread */
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ulint pri); /* in: priority: one of OS_PRIORITY_... */
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/**********************************************************************
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Gets the last operating system error code for the calling thread. */
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ulint
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os_thread_get_last_error(void);
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/*==========================*/
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#ifndef UNIV_NONINL
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#include "os0thread.ic"
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#endif
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#endif
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