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C $Header$ |
C $Header$ |
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C $Name$ |
C $Name$ |
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C |
C |
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C /==========================================================\ |
CBOP |
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C | BAR2.h | |
C !ROUTINE: BAR2.h |
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C | o Globals used by BAR2 Fortran barrier routine. | |
C !INTERFACE: |
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C |==========================================================| |
C include "BAR2.h" |
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C | These variables support a simple Fortran shared memory | |
C !DESCRIPTION: |
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C | barrier routine. They do busy waiting, that is the | |
C *==========================================================* |
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C | thread that is waiting sits in a tight loop reading | |
C | BAR2.h |
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C | some memory location and waiting for all other threads. | |
C | o Globals used by BAR2 Fortran barrier routine. |
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C | On some systems this is sometimes a good method to use. | |
C |==========================================================* |
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C | On the T3E memory is not shared so the routine should | |
C | These variables support a simple Fortran shared memory |
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C | use the T3E "eureka" barriers. On CRAY and NEC there are | |
C | barrier routine. They do busy waiting, that is the |
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C | hardware barriers that are accessed through a compiler | |
C | thread that is waiting sits in a tight loop reading |
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C | directives. Finally proper multi-threading compilers | |
C | some memory location and waiting for all other threads. |
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C | support barrier compile directives - sometimes these | |
C | On some systems this is sometimes a good method to use. |
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C | are good, sometimes they are lousy. | |
C | On the T3E memory is not shared so the routine should |
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C | The barrier mechanism is used as follows | |
C | use the T3E "eureka" barriers. On CRAY and NEC there are |
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C | 1. In the single-threaded part of the code | |
C | hardware barriers that are accessed through a compiler |
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C | CALL BAR2_INIT | |
C | directives. Finally proper multi-threading compilers |
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C | on CRAY, NEC this routine does nothing | |
C | support barrier compile directives - sometimes these |
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C | on T3E there is no single-threaded code | |
C | are good, sometimes they are lousy. |
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C | but there may be barrier initialisation - | |
C | The barrier mechanism is used as follows |
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C | need to check. | |
C | 1. In the single-threaded part of the code |
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C | 2. When we need to synchronize everybody just | |
C | CALL BAR2_INIT |
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C | CALL BAR2( myThid ) | |
C | on CRAY, NEC this routine does nothing |
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C | where myThid is myThreadId | |
C | on T3E there is no single-threaded code |
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C | on CRAY, NEC FBAR will just do C$DIR BARRIER | |
C | but there may be barrier initialisation - |
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C | or CALL BARRIER or the like. | |
C | need to check. |
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C | on T3E FBAR does CALL BARRIER(...) or something | |
C | 2. When we need to synchronize everybody just |
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C | need to check this. | |
C | CALL BAR2( myThid ) |
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C \==========================================================/ |
C | where myThid is myThreadId |
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|
C | on CRAY, NEC FBAR will just do C$DIR BARRIER |
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|
C | or CALL BARRIER or the like. |
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|
C | on T3E FBAR does CALL BARRIER(...) or something |
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|
C | need to check this. |
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|
C *==========================================================* |
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|
CEOP |
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COMMON /BAR2_BUFFER_I/ |
COMMON /BAR2_BUFFER_I/ |
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& BAR2_level, |
& BAR2_level, |
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& BAR2_barrierCount, |
& BAR2_barrierCount, |
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