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/****************************************************************************
* *
* FILE NAME VERSION *
* mai_dc.c MAPI 0.05 *
* *
* DESCRIPTION *
* This file contains the interfaces the down call interface to *
* the MAI subsystem *
* *
* DATA STRUCTURES *
* None *
* *
****************************************************************************/
#include "mai_l.h" /* Local mai function definitions */
/*
* FUNCTION
* mai_dc_read
*
* DESCRIPTION
* The caller acts as the DC thread of MAI. It purpose is to
* ensure that a thread is to do a down call receive,
* pulling mads up into MAI.
* It is in no way different from a normal application doing
* a mai_recv call, except that no filters should be associated with
* the handle owned by this thread. No filters .. means it never
* receives anything.
*
*
* INPUTS
* fd An open MAI handle.
*
* OUTPUTS
* VSTATUS_OK
* VSTATUS_ILLPARM
*
* HISTORY
* NAME DATE REMARKS
* PAW 03/19/02 Initial entry
*/
int mai_dc_read_exit = 0;
#define DC_THREAD_TIMEOUT (15000000)
static Mai_t mad;
int
mai_dc_read(IBhandle_t fd)
{
int rc;
IB_ENTER(__func__, fd, 0, 0, 0);
if (gMAI_USE_DEDICATED_DCTHREAD) {
if (gMAI_DCTHREAD_HANDLE != MAI_INVALID) {
IB_LOG_WARNX("down call thread handle is busy handle:",
gMAI_DCTHREAD_HANDLE);
IB_EXIT(__func__, VSTATUS_BUSY);
return VSTATUS_BUSY;
}
/*
* Remember the handle associated with the thread
*/
gMAI_DCTHREAD_HANDLE = fd;
/* release the waiting initiator thread */
cs_vsema(&gMAI_DCTHREAD_SEMA);
}
mai_dc_read_exit = 0;
if (mai_dc_read_exit == 1) {
IB_LOG_VERBOSE0("Mai DC Task exiting OK.");
return VSTATUS_OK;
}
do {
rc = mai_recv(fd, &mad, DC_THREAD_TIMEOUT);
} while (rc == VSTATUS_TIMEOUT);
if (rc != VSTATUS_TIMEOUT) {
if (rc == VSTATUS_CONNECT_GONE) {
IB_LOG_VERBOSERC("mai is shutting down rc:", rc);
} else {
IB_LOG_ERRORRC("bad status rc:", rc);
}
}
if (gMAI_USE_DEDICATED_DCTHREAD) {
/*
* Reset the handle associated with the DC thread
*/
gMAI_DCTHREAD_HANDLE = MAI_INVALID;
}
IB_EXIT(__func__, rc);
return rc;
}
/*
* FUNCTION
* mai_dc_reader
*
* DESCRIPTION
* Perpetually loops doing receives.
* It serves only to pull ensure that a thread is always
* doing a down call receive, pulling mads up into MAI.
* It is in no way different from a normal application doing
* a mai_recv call, except that no filters are associated with
* the handle owned by this thread. No filters .. means it never
* receives anything.
* Note that although a device, port, qp argument is passed in,
* ib_sma_recv that mai_rcv calls, always return the mads
* from any source that has been received. It is the filters
* in MAI that determines who gets what, not the open args.
*
*
* INPUTS
* dev A device to open.
* port A port on the device
* qp A qp on the port.
*
* OUTPUTS
* VSTATUS_OK
* VSTATUS_ILLPARM
*
* HISTORY
* NAME DATE REMARKS
* PAW 06/4/01 Initial entry
*/
int
mai_dc_reader(int qp, int dev, int port)
{
int rc;
IBhandle_t fd;
IB_ENTER(__func__, qp, dev, port, 0);
rc = mai_open(qp, dev, port, &fd);
if (rc != VSTATUS_OK)
return rc;
(void) mai_dc_read(fd);
IB_LOG_INFINI_INFO0("MAI DC Reader shutting down..");
(void) mai_close(fd);
IB_EXIT(__func__, 0);
return 0;
}
/*
* FUNCTION
* mai_spawn_dc_reader
*
* DESCRIPTION
* Spawn a thread that calls the mai_dc_read function.
*
* CALLED BY
*
* CALLS
* mai_dc_reader
*
* INPUTS
*
* OUTPUTS
*
* HISTORY
* NAME DATE REMARKS
* PAW 06/4/01 Initial entry
*/
struct {
int dev;
int qp;
int port;
} dc_reader_args;
static void
dc_reader_start(void)
{
int rc;
IB_ENTER(__func__,
dc_reader_args.qp,
dc_reader_args.dev, dc_reader_args.port, 0);
rc = mai_dc_reader(dc_reader_args.qp,
dc_reader_args.dev, dc_reader_args.port);
IB_EXIT(__func__, rc);
(void)(rc); // fix "unused" warning
}
/*
* FUNCTION
* mai_spawn_dc_reader
*
* DESCRIPTION
* Spawn a thread that calls the mai_dc_read function.
*
* CALLED BY
*
* CALLS
* vs_thread_create
*
* INPUTS
* dev A device to open.
* port A port on the device
* qp A qp on the port.
*
* OUTPUTS
* VSTATUS_OK
* VSTATUS_BAD
*
* HISTORY
* NAME DATE REMARKS
* PAW 06/4/01 Initial entry
*/
#define MAI_DC_STACK_SIZE (8*1024)
static Thread_t dc_thandle;
int
mai_spawn_dc_reader(int qp, int dev, int port)
{
int rc;
unsigned char name[VS_NAME_MAX];
IB_ENTER(__func__, qp, dev, port, 0);
dc_reader_args.qp = qp;
dc_reader_args.dev = dev;
dc_reader_args.port = port;
/*
* start the workert thread
*/
(void) memset (name, 8, sizeof(name));
(void) sprintf((void *)name,"mai_dc");
rc = vs_thread_create (&dc_thandle,
name,
(void (*)(uint32_t, uint8_t **))dc_reader_start,
0,NULL ,
MAI_DC_STACK_SIZE);
if (rc) {
IB_LOG_ERRORRC("failed to create MAI layer server thread rc:", rc);
IB_EXIT(__func__, rc);
return rc;
} else {
/* need to wait (up to 2 seconds) for the dedicated dcthread to initialize here */
return(cs_psema_wait(&gMAI_DCTHREAD_SEMA, 2));
}
IB_LOG_INFO("INFO: MAI layer server thread created ", rc);
IB_EXIT(__func__, 0);
return VSTATUS_OK;
}
#ifdef __VXWORKS__
void
mai_dc_read_kill(){
mai_dc_read_exit = 1;
}
#endif