| 1 |
C $Header: /u/u3/gcmpack/MITgcm/eesupp/src/check_threads.F,v 1.11 2003/11/11 20:38:26 edhill Exp $ |
| 2 |
C $Name: $ |
| 3 |
|
| 4 |
#include "CPP_EEOPTIONS.h" |
| 5 |
|
| 6 |
CBOP |
| 7 |
C !ROUTINE: CHECK_THREADS |
| 8 |
|
| 9 |
C !INTERFACE: |
| 10 |
SUBROUTINE CHECK_THREADS( myThid ) |
| 11 |
IMPLICIT NONE |
| 12 |
|
| 13 |
C !DESCRIPTION: |
| 14 |
C *========================================================== |
| 15 |
C | SUBROUTINE CHECK_THREADS |
| 16 |
C | o Check that all the threads we need did indeed start. |
| 17 |
C *========================================================== |
| 18 |
C | This routine is called during the initialisation phase |
| 19 |
C | to check whether all the threads have started. |
| 20 |
C | It is invoked by every thread and if any thread finds an |
| 21 |
C | error it should set its error flag. |
| 22 |
C | Notes: |
| 23 |
C | Different mechanisms may be required on different |
| 24 |
C | platforms to actually perform the check. For example as |
| 25 |
C | coded here each thread checks for a semaphore set by the |
| 26 |
C | other threads to see if they are running. |
| 27 |
C | It is also possible for a system to schedule threads |
| 28 |
C | sequentially, unless some system call is made to yield |
| 29 |
C | the process. This routine would detect this situation too |
| 30 |
C | and allow a programmer to modify this routine and the |
| 31 |
C | barrier code to allow threads to be scheduled more |
| 32 |
C | appropriately. |
| 33 |
C *========================================================== |
| 34 |
|
| 35 |
C !USES: |
| 36 |
C == Global variables == |
| 37 |
#include "SIZE.h" |
| 38 |
#include "EEPARAMS.h" |
| 39 |
#include "EESUPPORT.h" |
| 40 |
|
| 41 |
C !INPUT PARAMETERS: |
| 42 |
C == Routine arguments == |
| 43 |
C myThid :: My thread number |
| 44 |
INTEGER myThid |
| 45 |
|
| 46 |
C !LOCAL VARIABLES: |
| 47 |
C == Local variables == |
| 48 |
C I :: Loop counter |
| 49 |
C numberThreadRunning :: Count of number of threads this thread |
| 50 |
C thinks are running. |
| 51 |
C nChecks :: Number of times checked for all threads. After so |
| 52 |
C many checks give up and report an error. |
| 53 |
C msgBuffer :: Temp. for preparing text messages. |
| 54 |
INTEGER I |
| 55 |
INTEGER numberThreadsRunning |
| 56 |
INTEGER nChecks |
| 57 |
CHARACTER*(MAX_LEN_MBUF) msgBuffer |
| 58 |
CEOP |
| 59 |
|
| 60 |
C |
| 61 |
threadIsRunning(myThid) = .TRUE. |
| 62 |
nChecks = 0 |
| 63 |
|
| 64 |
10 CONTINUE |
| 65 |
numberThreadsRunning = 0 |
| 66 |
nChecks = nChecks + 1 |
| 67 |
DO I = 1, nThreads |
| 68 |
IF ( threadIsRunning(I) ) |
| 69 |
& numberThreadsRunning = numberThreadsRunning+1 |
| 70 |
ENDDO |
| 71 |
IF ( nChecks .GT. 10 ) THEN |
| 72 |
thError(myThid) = .TRUE. |
| 73 |
eeBootError = .TRUE. |
| 74 |
WRITE(msgBuffer,'(A,I5,A,I5,A)') |
| 75 |
& 'S/R INI_CHECK_THREADS: Only ',numberThreadsRunning, |
| 76 |
& ' thread(s), ',nThreads,' are needed for this configuration!' |
| 77 |
CALL PRINT_ERROR( msgBuffer , myThid) |
| 78 |
C-- Not enough threads are running so halt the program. |
| 79 |
C I did not want this here but it is the only place I have found that |
| 80 |
C KAP deadlocks if it there are fewer threads than iterations in a BLOCKED(1) |
| 81 |
C loop. The deadlock appears to be in the routine mppjoin which never |
| 82 |
C returns. I tried putting the STOP in main or breaking out of the loop in main |
| 83 |
C but this causes KAP to insert a call to mppjoin - which then deadlocks! |
| 84 |
IF ( myThid .EQ. 1 ) THEN |
| 85 |
STOP 'ABNORMAL END: S/R CHECK_THREADS' |
| 86 |
ENDIF |
| 87 |
GOTO 11 |
| 88 |
ENDIF |
| 89 |
IF ( numberThreadsRunning .NE. nThreads ) THEN |
| 90 |
#ifdef HAVE_SYSTEM |
| 91 |
CALL SYSTEM('sleep 1') |
| 92 |
#endif |
| 93 |
GOTO 10 |
| 94 |
ENDIF |
| 95 |
11 CONTINUE |
| 96 |
|
| 97 |
RETURN |
| 98 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph