Add .library("lib").mark("mark") and use it for .mark semaphores.

tapset-utrace.cxx (TOK_LIBRARY): New.
 (utrace_derived_probe::utrace_derived_probe): Add library and has_library.
 (utrace_builder::build): Handle library.
 (utrace_derived_probe_group::emit_probe_decl): Add sdt_sem_offset to
  emitted stap_utrace_probes.  Add stap_task_finder_target
  mmap_callback for handling shared library.  Handle sdt_sem_offset in
  emitted_stp_utrace_probe_cb.  Add stap_utrace_mmap_found.
 (register_tapset_utrace): Handle .library
tapset-utrace.cxx (TOK_LIBRARY): New.
 (base_query::base_query):  Add path and has_library.
 (dwarf_derived_probe::dwarf_derived_probe) Likewise.
 (dwarf_derived_probe::register_patterns):  Handle .library
 (sdt_query::convert_location): Likewise.
 (dwarf_builder::build):  Likewise.
 (uprobe_derived_probe_group::emit_module_decls): Emit
  sdt_sem_address.  Add sdt_sem_offset to emitted stap_uprobe_spec.
  Add offset and vm_flags to signature of stap_uprobe_change_plus, and
  handle sdt_sem_offset.  Allow writeable segments in emitted
  stap_uprobe_mmap_found.
sdt_misc.exp:  Test .library
util.cxx (find_executable):  Add env_path to sig and use it in getenv.
util.h (find_executable): Likewise.  Make "PATH" the default.
dtrace.in (provider): Turn on semaphores.
sdt.h: Likewise.

1 files changed, 2 insertions, 2 deletions

diff --git a/dtrace.in b/dtrace.in
index 10bd19e3..3be05038 100755
--- a/dtrace.in
+++ b/dtrace.in
@@ -46,7 +46,7 @@ class provider:
         self.f = open(provider)
         self.h = open(header,mode='w')
         self.h.write("/* Generated by the Systemtap dtrace wrapper */\n")
-        # self.h.write("\n#define STAP_HAS_SEMAPHORES 1\n\n")
+        self.h.write("\n#define STAP_HAS_SEMAPHORES 1\n\n")
         self.h.write("\n#include <sys/sdt.h>\n\n")
         in_comment = False
         typedefs = ""
@@ -107,7 +107,7 @@ class provider:
                     i += 1
                 self.h.write ('/* %s (%s) */\n' % (this_probe_canon,args_string))
                 # XXX Enable this when .so semaphores work properly
-                self.h.write ('#define %s_ENABLED() 1 /*%s_semaphore*/\n' % (this_probe_canon,this_probe))
+                self.h.write ('#define %s_ENABLED() %s_semaphore\n' % (this_probe_canon,this_probe))
                 # NB: unsigned short is fixed in ABI
                 self.h.write ("__extension__ extern unsigned short %s_semaphore __attribute__ ((unused)) __attribute__ ((section (\".probes\")));\n" % (this_probe))
                 self.h.write (define_str + ") \\\n")