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authorUlrich Drepper <drepper@redhat.com>2002-04-29 05:00:43 +0000
committerUlrich Drepper <drepper@redhat.com>2002-04-29 05:00:43 +0000
commitb74ea861cbd27f360e46190ac760d1300c737bc8 (patch)
tree603149e624ff46fb054f90d1691916eaf8f49571 /sysdeps
parentadd09583da3f652a6695dd534ea9ed4aefca97a0 (diff)
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Update.
* sysdeps/generic/tls.h: Describe would must be defined.
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/generic/tls.h57
1 files changed, 57 insertions, 0 deletions
diff --git a/sysdeps/generic/tls.h b/sysdeps/generic/tls.h
index 3820162..38f84ac 100644
--- a/sysdeps/generic/tls.h
+++ b/sysdeps/generic/tls.h
@@ -20,3 +20,60 @@
/* By default no TLS support is available. This is signaled by the
absence of the symbol USE_TLS. */
#undef USE_TLS
+
+
+/* An architecture-specific version of this file has to defined a
+ number of symbols:
+
+ TLS_TCB_AT_TP or TLS_DTV_AT_TP
+
+ The presence of one of these symbols signals which variant of
+ the TLS ABI is used. There are in the moment two variants
+ available:
+
+ * the thread pointer points to a thread control block
+
+ * the thread pointer points to the dynamic thread vector
+
+
+ TLS_TCB_SIZE
+
+ This is the size of the thread control block structure. How
+ this is actually defined depends on the ABI. The thread control
+ block could be internal descriptor of the thread library or
+ just a data structure which allows finding the DTV.
+
+ TLS_INIT_TCB_SIZE
+
+ Similarly, but this value is only used at startup and in the
+ dynamic linker itself. There are no threads in use at that time.
+
+
+ TLS_TCB_ALIGN
+
+ Alignment requirements for the TCB structure.
+
+ TLS_INIT_TCB_ALIGN
+
+ Similarly, but for the structure used at startup time.
+
+
+ INSTALL_DTV(tcb, init_dtv)
+
+ This macro must install the given initial DTV into the thread control
+ block TCB. The normal runtime functionality must then be able to
+ use the value.
+
+
+ TLS_INIT_TP(tcb)
+
+ This macro must initialize the thread pointer to enable normal TLS
+ operation. The parameter is a pointer to the thread control block.
+
+
+ THREAD_DTV()
+
+ This macro returns the address of the DTV of the current thread.
+ This normally is done using the the thread register which points
+ to the dtv or the TCB (from which the DTV can found).
+ */