/[MITgcm]/MITgcm/eesupp/inc/BARRIER.h
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Contents of /MITgcm/eesupp/inc/BARRIER.h

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Revision 1.5 - (show annotations) (download)
Sat Mar 27 03:51:50 2004 UTC (20 years, 1 month ago) by edhill
Branch: MAIN
CVS Tags: checkpoint57m_post, checkpoint57g_pre, checkpoint57s_post, checkpoint57b_post, checkpoint57g_post, checkpoint56b_post, checkpoint54d_post, checkpoint54e_post, checkpoint57r_post, checkpoint57d_post, checkpoint57i_post, checkpoint55, checkpoint54, checkpoint57, checkpoint56, checkpoint53, checkpoint57n_post, checkpoint54f_post, checkpoint55i_post, checkpoint57l_post, checkpoint57t_post, checkpoint55c_post, checkpoint57v_post, checkpoint57f_post, checkpoint53d_post, checkpoint57a_post, checkpoint57h_pre, checkpoint54b_post, checkpoint57h_post, checkpoint52m_post, checkpoint55g_post, checkpoint57c_post, checkpoint55d_post, checkpoint54a_pre, checkpoint53c_post, checkpoint55d_pre, checkpoint57c_pre, checkpoint55j_post, checkpoint54a_post, checkpoint55h_post, checkpoint57e_post, checkpoint55b_post, checkpoint53a_post, checkpoint55f_post, checkpoint53g_post, checkpoint57p_post, checkpint57u_post, checkpoint57q_post, eckpoint57e_pre, checkpoint56a_post, checkpoint53f_post, checkpoint57h_done, checkpoint57j_post, checkpoint57f_pre, checkpoint52n_post, checkpoint53b_pre, checkpoint56c_post, checkpoint57a_pre, checkpoint55a_post, checkpoint57o_post, checkpoint57k_post, checkpoint53b_post, checkpoint57w_post, checkpoint53d_pre, checkpoint55e_post, checkpoint54c_post
Changes since 1.4: +3 -3 lines
File MIME type: text/plain 
 o cleanup comments (NO CODE CHANGES) in eesupp for protex
 o the "api reference" framework now builds documentation for:
     eesupp, pkg/generic_advdiff, and pkg/gmredi
 o remove mnc from the default gfd in pkg_groups pending
     further testing on systems where NetCDF is not installed
1 C $Header: /u/gcmpack/MITgcm/eesupp/inc/BARRIER.h,v 1.4 2001/09/21 03:54:35 cnh Exp $
2 C $Name: $
3 CBOP
4 C !ROUTINE: BARRIER.h
5 C !INTERFACE:
6 C include "BARRIER.h"
7 C !DESCRIPTION:
8 C *==========================================================*
9 C | BARRIER.h
10 C | o Globals used by Fortran barrier routine.
11 C *==========================================================*
12 C | These variables support a simple Fortran shared memory
13 C | barrier routine. They do busy waiting, that is the
14 C | thread that is waiting sits in a tight loop reading
15 C | some memory location and waiting for all other threads.
16 C | On some systems this is sometimes a good method to use.
17 C | On the T3E memory is not shared so the routine should
18 C | use the T3E "eureka" barriers. On CRAY and NEC there are
19 C | hardware barriers that are accessed through a compiler
20 C | directives. Finally proper multi-threading compilers
21 C | support barrier compile directives - sometimes these
22 C | are good, sometimes they are lousy.
23 C | The barrier mechanism is used as follows
24 C | 1. In the single-threaded part of the code
25 C | CALL FBAR\_INIT
26 C | on CRAY, NEC this routine does nothing
27 C | on T3E there is no single-threaded code
28 C | but there may be barrier initialisation -
29 C | need to check.
30 C | 2. When we need to synchronize everybody just
31 C | CALL FBAR( myThid )
32 C | where myThid is myThreadId
33 C | on CRAY, NEC FBAR will just do C\$DIR BARRIER
34 C | or the like.
35 C | on T3E FBAR does CALL BARRIER(...) or something
36 C | need to check this.
37 C *==========================================================*
38 CEOP
39 COMMON / BARRIER_COMMON / key1, key2, key3,
40 & door1, door2, door3
41 INTEGER key1(lShare4,MAX_NO_THREADS)
42 INTEGER key2(lShare4,MAX_NO_THREADS)
43 INTEGER key3(lShare4,MAX_NO_THREADS)
44 INTEGER door1
45 INTEGER door2
46 INTEGER door3
47 INTEGER VALID
48 PARAMETER ( VALID = 1 )
49 INTEGER INVALID
50 PARAMETER ( INVALID = 0 )
51 INTEGER OPEN
52 PARAMETER ( OPEN = 1 )
53 INTEGER SHUT
54 PARAMETER ( SHUT = 0 )
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