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Add the --disable-initial-exec-tls configure option.

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Right now we always make our TLS use the initial-exec model if the compiler
supports it.  This change allows configure-time disabling of this setting, which
can be helpful when dynamically loading jemalloc is the only option.
This commit is contained in:
David Goldblatt
2018-04-17 12:52:22 -07:00
committed by David Goldblatt
parent e40b2f75bd
commit a62e42baeb
2 changed files with 35 additions and 6 deletions
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9
INSTALL.md
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@@ -265,6 +265,15 @@ any of the following arguments (not a definitive list) to 'configure':
configuration, jemalloc will provide additional size classes that are not
16-byte-aligned (24, 40, and 56).
* `--disable-initial-exec-tls`
Disable the initial-exec TLS model for jemalloc's internal thread-local
storage (on those platforms that support explicit settings). This can allow
jemalloc to be dynamically loaded after program starup (e.g. using dlopen).
Note that in this case, there will be two malloc implementations operating
in the same process, which will almost certainly result in confusing runtime
crashes if pointers leak from one implementation to the other.
The following environment variables (not a definitive list) impact configure's
behavior: