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2002-09-17 Robert Collins <rbtcollins@hotmail.com>

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This work inspires by Thomas Pfaff's pthread_fork patch (1).
        * fork.cc (fork_child): Remove MTinterface fixup call, it's
        adsorbed by pthread::atforkchild.
        Rename __pthread_atforkchild to pthread::atforkchild to give
        access to private members.
        (fork_parent): Rename __pthread_atforkparent to
        pthread::atforkparent to give it access to private members.
        Ditto for __pthread_atforkprepare.
        * thread.cc: Fix some formatting problems throughout.
        (MTinterface::fixup_before_fork): Implement.
        (MTinterface::fixup_after_fork): Fix pthread_keys.
        (pthread_key::keys): Implement.
        (pthread_key::fixup_before_fork): Ditto.
        (pthread_key::fixup_after_fork): Ditto.
        (pthread_key::pthread_key): Add to pthread_key::keys.
        (pthread_key::~pthread_key): Remove from pthread_key::keys.
        (pthread_key::saveKeyToBuffer): Implement.
        (pthread_key::recreateKeyFromBuffer): Ditto.
        (pthread::atforkprepare): Prepare all MT classes for fork.
        (pthread::atforkchild): And fix them up afterwards.
        * thread.h (pthread_key): Buffer the key value during
        fork in fork_buf.
        List the keys needing to be fixed up in a linked list with
        head pthread_key::keys.
        (pthread): Move atfork cygwin internal calls into the class.
        (MTInterface): Provide a fixup_before_fork for objecst that
        need to save state.
        (__pthread_atforkprepare): Remove.
        (__pthread_atforkparent): Remove.
        (__pthread_atforkchild): Remove.
This commit is contained in:
Robert Collins
2002-09-17 09:12:36 +00:00
parent cbb704cf60
commit f1f1379560
4 changed files with 148 additions and 37 deletions
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20
winsup/cygwin/thread.h
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@@ -178,11 +178,21 @@ class pthread_key:public verifyable_object
public:
DWORD dwTlsIndex;
void *fork_buf;
class pthread_key *next;
int set (const void *);
void *get ();
pthread_key (void (*)(void *));
~pthread_key ();
static void fixup_before_fork();
static void fixup_after_fork();
private:
// lists of objects. USE THREADSAFE INSERTS AND DELETES.
static pthread_key * keys;
void saveKeyToBuffer ();
void recreateKeyFromBuffer ();
};
/* FIXME: test using multiple inheritance and merging key_destructor into pthread_key
@@ -281,6 +291,9 @@ public:
static void initMainThread(pthread *, HANDLE);
static bool isGoodObject(pthread_t *);
static void atforkprepare();
static void atforkparent();
static void atforkchild();
virtual void exit (void *value_ptr);
@@ -421,12 +434,13 @@ public:
callback *pthread_child;
callback *pthread_parent;
// list of mutex's. USE THREADSAFE INSERTS AND DELETES.
// lists of pthread objects. USE THREADSAFE INSERTS AND DELETES.
class pthread_mutex * mutexs;
class pthread_cond * conds;
class semaphore * semaphores;
void Init (int);
void fixup_before_fork (void);
void fixup_after_fork (void);
MTinterface ():reent_index (0), indexallocated (0), threadcount (1)
@@ -437,10 +451,6 @@ public:
}
};
void __pthread_atforkprepare(void);
void __pthread_atforkparent(void);
void __pthread_atforkchild(void);
/* Cancellation */
int __pthread_cancel (pthread_t thread);