Fix: i386 compat code duplicated mutex instances
authorMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mon, 30 Sep 2013 18:40:33 +0000 (14:40 -0400)
committerMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mon, 30 Sep 2013 18:40:33 +0000 (14:40 -0400)
commit976720e446de1d3831bc7847b920c397a7ee26b1
tree4ec40865a047ff7de5c3a6253643e30e0f07ce22
parent9d8612b71148c42a430e1419bad3b9b09453f64a
Fix: i386 compat code duplicated mutex instances

compat_arch_x86.c is linked into many .so and even into test programs.
The basic problem with this is that it contains a statically defined
mutex, which will fail to protect concurrent use of this compat code by
different shared objects.

Fix this by defining both the mutex (now called __urcu_x86_compat_mutex)
and __rcu_cas_avail as weak symbols. Therefore, the first symbol that
gets loaded in a program will by used by everyone.

Reported-by: Vladimir Nikulichev <nvs@tbricks.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
compat_arch_x86.c
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