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nptl: Make pthread_attr_t dynamically extensible

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This introduces the function __pthread_attr_extension to allocate the
extension space, which is freed by pthread_attr_destroy.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer
2020-06-02 10:33:30 +02:00
parent 6993670b52
commit 7538d46113
10 changed files with 98 additions and 33 deletions
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16
sysdeps/nptl/internaltypes.h
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@@ -36,9 +36,10 @@ struct pthread_attr
/* Stack handling. */
void *stackaddr;
size_t stacksize;
/* Affinity map. */
cpu_set_t *cpuset;
size_t cpusetsize;
/* Allocated via a call to __pthread_attr_extension once needed. */
struct pthread_attr_extension *extension;
void *unused;
};
#define ATTR_FLAG_DETACHSTATE 0x0001
@@ -57,6 +58,15 @@ union pthread_attr_transparent
struct pthread_attr internal;
};
/* Extension space for pthread attributes. Referenced by the
extension member of struct pthread_attr. */
struct pthread_attr_extension
{
/* Affinity map. */
cpu_set_t *cpuset;
size_t cpusetsize;
};
/* Mutex attribute data structure. */
struct pthread_mutexattr
{