c++ - Deletion of Pointers Issue -

i having trouble deleting pointers have created. program creates double pointer point threads. creates threads dynamically. @ end deletes them getting glibc error. uses boost create threads. puzzling delete similar double pointer same exact way , executes fine. issue @ end of code block under heading of /*clean up*/:

boost :: thread** thrds;  //create threads , bind p_variantforloop_t thrds = new boost::thread*[numthreads];  (int = 1; <= numthreads; i++)     thrds[i] = new boost::thread(boost::bind(&p_variantforloop_t,          e, a, d, (i*n-n)/i ,(i*n)/n, numthreads, n));   /* join threads */ (int = 0; < numthreads; i++)     thrds[i]->join();  /* cleanup */ (int = 0; < numthreads; i++)     delete thrds[i]; delete[] thrds; 

the error is:

*** glibc detected *** ./hw9: munmap_chunk(): invalid pointer: 0x0957d480 ***
======= backtrace: =========
/lib/tls/i686/cmov/libc.so.6(+0x6b591)[0x264591]
/lib/tls/i686/cmov/libc.so.6(+0x6c80e)[0x26580e]
/usr/lib/libstdc++.so.6(_zdlpv+0x21)[0x529741]
./hw9[0x804a0d1]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe6)[0x20fbd6]
./hw9[0x8049871]
======= memory map: ========
001f9000-0034c000 r-xp 00000000 08:02 1128663 /lib/tls/i686/cmov/libc-2.11.1.so
0034c000-0034d000 ---p 00153000 08:02 1128663 /lib/tls/i686/cmov/libc-2.11.1.so
0034d000-0034f000 r--p 00153000 08:02 1128663 /lib/tls/i686/cmov/libc-2.11.1.so
0034f000-00350000 rw-p 00155000 08:02 1128663 /lib/tls/i686/cmov/libc-2.11.1.so
00350000-00353000 rw-p 00000000 00:00 0
0046e000-00557000 r-xp 00000000 08:02 982712 /usr/lib/libstdc++.so.6.0.13
00557000-00558000 ---p 000e9000 08:02 982712 /usr/lib/libstdc++.so.6.0.13
00558000-0055c000 r--p 000e9000 08:02 982712 /usr/lib/libstdc++.so.6.0.13
0055c000-0055d000 rw-p 000ed000 08:02 982712 /usr/lib/libstdc++.so.6.0.13
0055d000-00564000 rw-p 00000000 00:00 0
005ad000-005d1000 r-xp 00000000 08:02 1130719 /lib/tls/i686/cmov/libm-2.11.1.so
005d1000-005d2000 r--p 00023000 08:02 1130719 /lib/tls/i686/cmov/libm-2.11.1.so
005d2000-005d3000 rw-p 00024000 08:02 1130719 /lib/tls/i686/cmov/libm-2.11.1.so
00950000-00965000 r-xp 00000000 08:02 1130743 /lib/tls/i686/cmov/libpthread-2.11.1.so
00965000-00966000 r--p 00014000 08:02 1130743 /lib/tls/i686/cmov/libpthread-2.11.1.so
00966000-00967000 rw-p 00015000 08:02 1130743 /lib/tls/i686/cmov/libpthread-2.11.1.so
00967000-00969000 rw-p 00000000 00:00 0
00a67000-00a7a000 r-xp 00000000 08:02 176445 /usr/lib/libboost_thread.so.1.40.0
00a7a000-00a7b000 r--p 00013000 08:02 176445 /usr/lib/libboost_thread.so.1.40.0
00a7b000-00a7c000 rw-p 00014000 08:02 176445 /usr/lib/libboost_thread.so.1.40.0
00bc7000-00be2000 r-xp 00000000 08:02 1128318 /lib/ld-2.11.1.so
00be2000-00be3000 r--p 0001a000 08:02 1128318 /lib/ld-2.11.1.so
00be3000-00be4000 rw-p 0001b000 08:02 1128318 /lib/ld-2.11.1.so
00c34000-00c3b000 r-xp 00000000 08:02 1130745 /lib/tls/i686/cmov/librt-2.11.1.so
00c3b000-00c3c000 r--p 00006000 08:02 1130745 /lib/tls/i686/cmov/librt-2.11.1.so
00c3c000-00c3d000 rw-p 00007000 08:02 1130745 /lib/tls/i686/cmov/librt-2.11.1.so
00ccf000-00cd0000 r-xp 00000000 00:00 0 [vdso]
00e85000-00ea2000 r-xp 00000000 08:02 1128359 /lib/libgcc_s.so.1
00ea2000-00ea3000 r--p 0001c000 08:02 1128359 /lib/libgcc_s.so.1
00ea3000-00ea4000 rw-p 0001d000 08:02 1128359 /lib/libgcc_s.so.1
08048000-0804e000 r-xp 00000000 00:1d 10184 /home/tparisi/desktop/source_code_hw5/hw9
0804e000-0804f000 r--p 00005000 00:1d 10184 /home/tparisi/desktop/source_code_hw5/hw9
0804f000-08050000 rw-p 00006000 00:1d 10184 /home/tparisi/desktop/source_code_hw5/hw9
0957d000-0959e000 rw-p 00000000 00:00 0 [heap]
b68bf000-b68c0000 ---p 00000000 00:00 0
b68c0000-b70c0000 rw-p 00000000 00:00 0
b70c0000-b70c1000 ---p 00000000 00:00 0
b70c1000-b78c4000 rw-p 00000000 00:00 0
b78e8000-b78eb000 rw-p 00000000 00:00 0
bfc07000-bfc1c000 rw-p 00000000 00:00 0 [stack]
aborted

you omit first element of array when creating thread object. stays uninitialized pointer value, causing invalid pointer error later.

there issue of writing memory after last element of array, in problematic loop (i.e. first for in code).