[Guile-commits] GNU Guile branch, wip-nj-thread-safety, created. release_1-8-6-37-gd460681

[Neil Jerram]

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http://git.savannah.gnu.org/cgit/guile.git/commit/?id=d460681c796139d904b42c7a378f3964b453daf6

The branch, wip-nj-thread-safety has been created
        at  d460681c796139d904b42c7a378f3964b453daf6 (commit)

- Log -----------------------------------------------------------------
commit d460681c796139d904b42c7a378f3964b453daf6
Author: Neil Jerram <address@hidden>
Date:   Wed Mar 25 22:52:01 2009 +0000

    wip

commit 7627abf6ecf1770367ea2c5f8d61e14fa4843c8a
Author: Neil Jerram <address@hidden>
Date:   Wed Mar 25 22:50:46 2009 +0000

    Allow non-weak hash tables to be automatically thread-safe
    
    This patch allows a fat mutex to be associated with a hash table.
    When a hash table has an associated mutex, that mutex will be
    automatically locked and unlocked around all operations (include
    lookups) on the hash table's internal data.
    
    * libguile/hashtab.c (make_hash_table): Init mutex field to #f.
    
      (hashtable_mark): New function.
    
      (scm_hash_fn_get_handle, scm_hash_fn_create_handle_x,
      scm_hash_fn_remove_x, scm_hash_clear_x, scm_internal_hash_fold,
      scm_internal_hash_for_each_handle): If the hash table has a mutex,
      lock and unlock it around all accessing of the hash table's
      internals.
    
      (scm_hash_use_mutex_x): New function.
    
      (scm_hashtab_prehistory): Use hashtable_mark as hash table mark
      function.
    
    * libguile/hashtab.h (SCM_HASHTABLE_MUTEX, SCM_SET_HASHTABLE_MUTEX,
      scm_hash_use_mutex_x): New declarations.
    
      (scm_t_hashtable): New mutex field.

commit 7b6b81cfef3705d20715b978b51004a8c4a6ddf6
Author: Neil Jerram <address@hidden>
Date:   Wed Mar 25 22:34:23 2009 +0000

    Make the interned symbols hash thread-safe
    
    These changes introduce a mutex that protects all accesses to and
    modifications of the symbols hash.  They allow the test-define-race
    test to run without errors for a long time.  (Well, for 200s anyway.)
    
    * libguile/environments.c (obarray_enter, obarray_replace): Extra
      parameter on scm_i_rehash calls.
    
    * libguile/hashtab.c: Include symbols.h.
    
      (scm_i_rehash): New mutex parameter.  When non-NULL, unlock and
      relock this mutex around allocations, and recheck new size
      calculation (in case another thread has changed it).
    
      (rehash_after_gc): Special treatment for the symbol hash.
    
      (scm_hash_fn_create_handle_x, scm_hash_fn_remove_x): Extra parameter on 
scm_i_rehash calls.
    
    * libguile/hashtab.h (scm_i_rehash): New mutex parameter.
    
    * libguile/symbols.c (symbols): Rename scm_i_symbols and make non-static.
    
      (symbols_mutex): New variable.
    
      (scm_sys_symbols): symbols -> scm_i_symbols.
    
      (lookup_interned_symbol): Lock symbols_mutex while performing lookup.
    
      (intern_symbol): Add name, len and raw_hash parameters.  Lock
      symbols_mutex while checking and modifying the symbols hash.  Once
      the mutex is locked, recheck in case another thread has already
      interned the symbol.  Return interned symbol, in order to tell
      callers about this last case.
    
      (scm_i_c_mem2symbol, scm_i_mem2symbol, scm_take_locale_symboln):
      Update intern_symbol calls.
    
      (scm_i_rehash_symbols_after_gc): New function.
    
      (scm_symbols_prehistory): symbols -> scm_i_symbols.  Initialize
      symbols_mutex.
    
    * libguile/symbols.h (scm_i_symbols, scm_i_rehash_symbols_after_gc):
      New declarations.

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