rtld_lock.h: add some comments about versioning of struct RtldLockInfo
Sponsored by: The FreeBSD Foundation MFC after: 6 days
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@ -35,9 +35,20 @@
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#define MAX_RTLD_LOCKS 8
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#define MAX_RTLD_LOCKS 8
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/*
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* This structure is part of the ABI between rtld and threading
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* libraries, like libthr and even libc_r. Its layout is fixed and
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* can be changed only by appending new fields at the end, with the
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* bump of RTLI_VERSION.
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*/
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struct RtldLockInfo
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struct RtldLockInfo
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{
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{
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/*
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* Valid if the object calling _rtld_thread_init() exported
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* symbol _pli_rtli_version. Otherwise assume RTLI_VERSION_ONE.
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*/
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unsigned int rtli_version;
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unsigned int rtli_version;
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void *(*lock_create)(void);
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void *(*lock_create)(void);
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void (*lock_destroy)(void *);
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void (*lock_destroy)(void *);
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void (*rlock_acquire)(void *);
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void (*rlock_acquire)(void *);
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@ -46,6 +57,8 @@ struct RtldLockInfo
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int (*thread_set_flag)(int);
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int (*thread_set_flag)(int);
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int (*thread_clr_flag)(int);
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int (*thread_clr_flag)(int);
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void (*at_fork)(void);
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void (*at_fork)(void);
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/* Version 2 fields */
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char *(*dlerror_loc)(void);
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char *(*dlerror_loc)(void);
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int *(*dlerror_seen)(void);
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int *(*dlerror_seen)(void);
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int dlerror_loc_sz;
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int dlerror_loc_sz;
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