85 lines
2.4 KiB
C
85 lines
2.4 KiB
C
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/****************************************************************
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* *
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* Copyright 2007, 2011 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#include "mdef.h"
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#include "gdsroot.h"
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#include "gtm_facility.h"
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#include "fileinfo.h"
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#include "gdsbt.h"
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#include "gdsblk.h"
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#include "gdsfhead.h"
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#include "interlock.h"
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#include "gdsbgtr.h"
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#include "sleep_cnt.h"
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#include "wbox_test_init.h"
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/* Include prototypes */
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#include "wcs_sleep.h"
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#include "is_proc_alive.h"
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#include "wcs_read_in_progress_wait.h"
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#include "add_inter.h"
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#include "caller_id.h"
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/* Waits for a concurrently running read (from disk into a global buffer) to complete.
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*
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* Returns TRUE if read completes within timeout of approx. 1 minute.
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* Returns FALSE otherwise.
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*
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* Similar logic is also present in t_qread and wcs_recover but they are different enough that
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* they have not been folded into this routine yet.
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*/
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boolean_t wcs_read_in_progress_wait(cache_rec_ptr_t cr, wbtest_code_t wbox_test_code)
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{
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uint4 lcnt, r_epid;
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int4 n;
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for (lcnt = 1; -1 != cr->read_in_progress; lcnt++)
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{
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if (-1 > cr->read_in_progress)
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{ /* outside of design; clear to known state */
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assert(0 == cr->r_epid);
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cr->r_epid = 0;
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INTERLOCK_INIT(cr);
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break;
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}
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wcs_sleep(lcnt);
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GTM_WHITE_BOX_TEST(wbox_test_code, lcnt, (2 * BUF_OWNER_STUCK));
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if (BUF_OWNER_STUCK < lcnt)
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{ /* sick of waiting */
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/* Since cr->r_epid can be changing concurrently, take a local copy before using it below,
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* particularly before calling is_proc_alive as we dont want to call it with a 0 r_epid.
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*/
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r_epid = cr->r_epid;
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if (0 != r_epid)
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{
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if (FALSE == is_proc_alive(r_epid, cr->image_count))
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{ /* process gone; release its lock */
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cr->r_epid = 0;
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RELEASE_BUFF_READ_LOCK(cr);
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} else
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{
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assert(gtm_white_box_test_case_enabled);
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return FALSE;
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}
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} else
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{ /* process stopped before could set r_epid */
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RELEASE_BUFF_READ_LOCK(cr); /* cr->r_epid already 0 no need to reset */
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if (-1 > cr->read_in_progress)
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{ /* process released since if (cr->r_epid); rectify semaphore */
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LOCK_BUFF_FOR_READ(cr, n);
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}
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}
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} /* sick of waiting */
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}
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return TRUE;
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}
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