ACE/ace/System_Time.cpp

   1 #include "ace/System_Time.h"
   2 #include "ace/MMAP_Memory_Pool.h"
   3 #include "ace/Malloc_T.h"
   4 #include "ace/Null_Mutex.h"
   5 #include "ace/Time_Value.h"
   6 #include "ace/Lib_Find.h"
   7
   8 #include "ace/OS_NS_string.h"
   9 #include "ace/OS_NS_time.h"
  10
  11
  12 ACE_BEGIN_VERSIONED_NAMESPACE_DECL
  13
  14 ACE_System_Time::ACE_System_Time (const ACE_TCHAR *poolname)
  15   : shmem_ (0)
  16   , delta_time_ (0)
  17 {
  18   ACE_TRACE ("ACE_System_Time::ACE_System_Time");
  19
  20   // Only create a new unique filename for the memory pool file
  21   // if the user didn't supply one...
  22   if (poolname == 0)
  23     {
  24 #if defined (ACE_DEFAULT_BACKING_STORE)
  25       // Create a temporary file.
  26       ACE_OS::strcpy (this->poolname_,
  27                       ACE_DEFAULT_BACKING_STORE);
  28 #else /* ACE_DEFAULT_BACKING_STORE */
  29       if (ACE::get_temp_dir (this->poolname_,
  30                                       MAXPATHLEN - 17) == -1)
  31         // -17 for ace-malloc-XXXXXX
  32         {
  33           ACELIB_ERROR ((LM_ERROR,
  34                       ACE_TEXT ("Temporary path too long, ")
  35                       ACE_TEXT ("defaulting to current directory\n")));
  36           this->poolname_[0] = 0;
  37         }
  38
  39       // Add the filename to the end
  40       ACE_OS::strcat (this->poolname_, ACE_TEXT ("ace-malloc-XXXXXX"));
  41
  42 #endif /* ACE_DEFAULT_BACKING_STORE */
  43     }
  44   else
  45     ACE_OS::strsncpy (this->poolname_,
  46                       poolname,
  47                       (sizeof this->poolname_ / sizeof (ACE_TCHAR)));
  48
  49   ACE_NEW (this->shmem_,
  50            ALLOCATOR (this->poolname_));
  51 }
  52
  53 ACE_System_Time::~ACE_System_Time ()
  54 {
  55   ACE_TRACE ("ACE_System_Time::~ACE_System_Time");
  56   delete this->shmem_;
  57 }
  58
  59 // Get the local system time.
  60
  61 int
  62 ACE_System_Time::get_local_system_time (time_t & time_out)
  63 {
  64   ACE_TRACE ("ACE_System_Time::get_local_system_time");
  65   time_out = ACE_OS::time (0);
  66   return 0;
  67 }
  68
  69 int
  70 ACE_System_Time::get_local_system_time (ACE_Time_Value &time_out)
  71 {
  72   ACE_TRACE ("ACE_System_Time::get_local_system_time");
  73   time_out.set (ACE_OS::time (0), 0);
  74   return 0;
  75 }
  76
  77 // Get the system time of the central time server.
  78
  79 int
  80 ACE_System_Time::get_master_system_time (time_t &time_out)
  81 {
  82   ACE_TRACE ("ACE_System_Time::get_master_system_time");
  83
  84   if (this->delta_time_ == 0)
  85     {
  86       // Try to find it
  87       void * temp = 0;
  88       if (this->shmem_->find (ACE_DEFAULT_TIME_SERVER_STR, temp) == -1)
  89         {
  90           // No time entry in shared memory (meaning no Clerk exists)
  91           // so return the local time of the host.
  92           return this->get_local_system_time (time_out);
  93         }
  94       else
  95         // Extract the delta time.
  96         this->delta_time_ = static_cast<long *> (temp);
  97     }
  98
  99   time_t local_time;
 100
 101   // If delta_time is positive, it means that the system clock is
 102   // ahead of our local clock so add delta to the local time to get an
 103   // approximation of the system time. Else if delta time is negative,
 104   // it means that our local clock is ahead of the system clock, so
 105   // return the last local time stored (to avoid time conflicts).
 106   if (*this->delta_time_ >= 0 )
 107     {
 108       this->get_local_system_time (local_time);
 109       time_out = local_time + static_cast<ACE_UINT32> (*this->delta_time_);
 110     }
 111   else
 112     // Return the last local time. Note that this is stored as the
 113     // second field in shared memory.
 114     time_out = *(this->delta_time_ + 1);
 115   return 0;
 116 }
 117
 118 int
 119 ACE_System_Time::get_master_system_time (ACE_Time_Value &time_out)
 120 {
 121   ACE_TRACE ("ACE_System_Time::get_master_system_time");
 122   time_t to;
 123   if (this->get_master_system_time (to) == -1)
 124     return -1;
 125   time_out.sec (to);
 126   return 0;
 127 }
 128
 129 // Synchronize local system time with the central time server using
 130 // specified mode (currently unimplemented).
 131
 132 int
 133 ACE_System_Time::sync_local_system_time (ACE_System_Time::Sync_Mode)
 134 {
 135   ACE_TRACE ("ACE_System_Time::sync_local_system_time");
 136   ACE_NOTSUP_RETURN (-1);
 137 }
 138
 139 ACE_END_VERSIONED_NAMESPACE_DECL