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authorUlrich Drepper <drepper@redhat.com>1999-02-14 20:14:54 +0000
committerUlrich Drepper <drepper@redhat.com>1999-02-14 20:14:54 +0000
commit0543cd2694e19a95572421988cce8c6c170e2aba (patch)
treeb0b8793f4da6fbdcc24fe85d97f29ace5b4feb74 /linuxthreads
parent6e0d277c5ee4b443f58e2aeea305cee520e326d6 (diff)
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Update.
1999-02-13 Andreas Schwab <schwab@issan.cs.uni-dortmund.de> * misc/syslog.c (vsyslog): Remember errno for %m format. Fix check for priority mask.
Diffstat (limited to 'linuxthreads')
-rw-r--r--linuxthreads/ChangeLog15
-rw-r--r--linuxthreads/Versions4
-rw-r--r--linuxthreads/internals.h5
-rw-r--r--linuxthreads/pthread.c128
4 files changed, 120 insertions, 32 deletions
diff --git a/linuxthreads/ChangeLog b/linuxthreads/ChangeLog
index 352b34356f..363712f8e6 100644
--- a/linuxthreads/ChangeLog
+++ b/linuxthreads/ChangeLog
@@ -1,3 +1,18 @@
+1999-02-12 H.J. Lu <hjl@gnu.org>
+
+ * Versions (__libc_current_sigrtmin, __libc_current_sigrtmax,
+ __libc_allocate_rtsig): Added to GLIBC_2.1.
+
+ * internals.h (DEFAULT_SIG_RESTART): Removed.
+ (DEFAULT_SIG_CANCEL): Removed.
+
+ * pthread.c (init_rtsigs, __libc_current_sigrtmin,
+ __libc_current_sigrtmax, __libc_allocate_rtsig): New functions.
+ (__pthread_sig_restart, __pthread_sig_cancel,
+ __pthread_sig_debug): Initialized.
+ (pthread_initialize): Call init_rtsigs () to initialize
+ real-time signals.
+
1999-02-03 H.J. Lu <hjl@gnu.org>
* manager.c (__pthread_manager): Do block __pthread_sig_debug.
diff --git a/linuxthreads/Versions b/linuxthreads/Versions
index f47727dd35..2d553f1d10 100644
--- a/linuxthreads/Versions
+++ b/linuxthreads/Versions
@@ -93,5 +93,9 @@ libpthread {
pthread_getconcurrency; pthread_setconcurrency;
pthread_mutexattr_gettype; pthread_mutexattr_settype;
+
+ # helper functions
+ __libc_current_sigrtmin; __libc_current_sigrtmax;
+ __libc_allocate_rtsig;
}
}
diff --git a/linuxthreads/internals.h b/linuxthreads/internals.h
index 0654c32758..cfd72cda72 100644
--- a/linuxthreads/internals.h
+++ b/linuxthreads/internals.h
@@ -152,11 +152,6 @@ extern int __pthread_sig_cancel;
extern int __pthread_sig_debug;
-/* Default signals used if we don't have realtime signals */
-
-#define DEFAULT_SIG_RESTART SIGUSR1
-#define DEFAULT_SIG_CANCEL SIGUSR2
-
/* Global array of thread handles, used for validating a thread id
and retrieving the corresponding thread descriptor. Also used for
mapping the available stack segments. */
diff --git a/linuxthreads/pthread.c b/linuxthreads/pthread.c
index 42ed581bdb..b7cf573fe9 100644
--- a/linuxthreads/pthread.c
+++ b/linuxthreads/pthread.c
@@ -146,17 +146,6 @@ const int __pthread_offsetof_descr = offsetof(struct pthread_handle_struct,
const int __pthread_offsetof_pid = offsetof(struct _pthread_descr_struct,
p_pid);
-/* Signal numbers used for the communication. */
-#ifdef SIGRTMIN
-int __pthread_sig_restart;
-int __pthread_sig_cancel;
-int __pthread_sig_debug;
-#else
-int __pthread_sig_restart = DEFAULT_SIG_RESTART;
-int __pthread_sig_cancel = DEFAULT_SIG_CANCEL;
-int __pthread_sig_debug = 0; /* disabled */
-#endif
-
/* These variables are used by the setup code. */
extern int _errno;
extern int _h_errno;
@@ -173,6 +162,104 @@ static void pthread_handle_sigrestart(int sig, struct sigcontext ctx);
#endif
static void pthread_handle_sigdebug(int sig);
+/* Signal numbers used for the communication.
+ In these variables we keep track of the used variables. If the
+ platform does not support any real-time signals we will define the
+ values to some unreasonable value which will signal failing of all
+ the functions below. */
+#ifndef __SIGRTMIN
+static int current_rtmin = -1;
+static int current_rtmax = -1;
+int __pthread_sig_restart = SIGUSR1;
+int __pthread_sig_cancel = SIGUSR2;
+int __pthread_sig_debug = 0;
+#else
+static int current_rtmin;
+static int current_rtmax;
+
+#if __SIGRTMAX - __SIGRTMIN >= 3
+int __pthread_sig_restart = __SIGRTMIN;
+int __pthread_sig_cancel = __SIGRTMIN + 1;
+int __pthread_sig_debug = __SIGRTMIN + 2;
+#else
+int __pthread_sig_restart = SIGUSR1;
+int __pthread_sig_cancel = SIGUSR2;
+int __pthread_sig_debug = 0;
+#endif
+
+static int rtsigs_initialized;
+
+#include "testrtsig.h"
+
+static void
+init_rtsigs (void)
+{
+ if (!kernel_has_rtsig ())
+ {
+ current_rtmin = -1;
+ current_rtmax = -1;
+#if __SIGRTMAX - __SIGRTMIN >= 3
+ __pthread_sig_restart = SIGUSR1;
+ __pthread_sig_cancel = SIGUSR2;
+ __pthread_sig_debug = 0;
+#endif
+ }
+ else
+ {
+#if __SIGRTMAX - __SIGRTMIN >= 3
+ current_rtmin = __SIGRTMIN + 3;
+#else
+ current_rtmin = __SIGRTMIN;
+#endif
+
+ current_rtmax = __SIGRTMAX;
+ }
+
+ rtsigs_initialized = 1;
+}
+#endif
+
+/* Return number of available real-time signal with highest priority. */
+int
+__libc_current_sigrtmin (void)
+{
+#ifdef __SIGRTMIN
+ if (!rtsigs_initialized)
+ init_rtsigs ();
+#endif
+ return current_rtmin;
+}
+
+/* Return number of available real-time signal with lowest priority. */
+int
+__libc_current_sigrtmax (void)
+{
+#ifdef __SIGRTMIN
+ if (!rtsigs_initialized)
+ init_rtsigs ();
+#endif
+ return current_rtmax;
+}
+
+/* Allocate real-time signal with highest/lowest available
+ priority. Please note that we don't use a lock since we assume
+ this function to be called at program start. */
+int
+__libc_allocate_rtsig (int high)
+{
+#ifndef __SIGRTMIN
+ return -1;
+#else
+ if (!rtsigs_initialized)
+ init_rtsigs ();
+ if (current_rtmin == -1 || current_rtmin > current_rtmax)
+ /* We don't have anymore signal available. */
+ return -1;
+
+ return high ? current_rtmin++ : current_rtmax--;
+#endif
+}
+
/* Initialize the pthread library.
Initialization is split in two functions:
- a constructor function that blocks the __pthread_sig_restart signal
@@ -219,22 +306,9 @@ static void pthread_initialize(void)
/* The errno/h_errno variable of the main thread are the global ones. */
__pthread_initial_thread.p_errnop = &_errno;
__pthread_initial_thread.p_h_errnop = &_h_errno;
-#ifdef SIGRTMIN
- /* Allocate the signals used. */
- __pthread_sig_restart = __libc_allocate_rtsig (1);
- __pthread_sig_cancel = __libc_allocate_rtsig (1);
- __pthread_sig_debug = __libc_allocate_rtsig (1);
- if (__pthread_sig_restart < 0 ||
- __pthread_sig_cancel < 0 ||
- __pthread_sig_debug < 0)
- {
- /* The kernel does not support real-time signals. Use as before
- the available signals in the fixed set.
- Debugging is not supported in this case. */
- __pthread_sig_restart = DEFAULT_SIG_RESTART;
- __pthread_sig_cancel = DEFAULT_SIG_CANCEL;
- __pthread_sig_debug = 0;
- }
+#ifdef __SIGRTMIN
+ /* Initialize real-time signals. */
+ init_rtsigs ();
#endif
/* Setup signal handlers for the initial thread.
Since signal handlers are shared between threads, these settings