ENH: _lib/ccallback: use gcc threadlocal storage, if available to speed things up
ENH: _lib/ccallback: use gcc threadlocal storage, if available to speed things up

Stefan-Endres/scipy,vigna/scipy,aeklant/scipy,grlee77/scipy,zerothi/scipy,e-q/scipy,tylerjereddy/scipy,Eric89GXL/scipy,jor-/scipy,josephcslater/scipy,e-q/scipy,kalvdans/scipy,josephcslater/scipy,andyfaff/scipy,jjhelmus/scipy,jjhelmus/scipy,pbrod/scipy,befelix/scipy,Stefan-Endres/scipy,vigna/scipy,nmayorov/scipy,vigna/scipy,lhilt/scipy,jor-/scipy,anntzer/scipy,perimosocordiae/scipy,zerothi/scipy,gertingold/scipy,apbard/scipy,aeklant/scipy,dominicelse/scipy,pbrod/scipy,pschella/scipy,pbrod/scipy,jamestwebber/scipy,e-q/scipy,mdhaber/scipy,pschella/scipy,lhilt/scipy,rgommers/scipy,apbard/scipy,anntzer/scipy,WarrenWeckesser/scipy,jakevdp/scipy,lhilt/scipy,jjhelmus/scipy,rgommers/scipy,endolith/scipy,aeklant/scipy,pbrod/scipy,jamestwebber/scipy,jamestwebber/scipy,Stefan-Endres/scipy,mdhaber/scipy,gfyoung/scipy,pizzathief/scipy,endolith/scipy,endolith/scipy,person142/scipy,arokem/scipy,anntzer/scipy,vigna/scipy,scipy/scipy,ilayn/scipy,pizzathief/scipy,scipy/scipy,arokem/scipy,Stefan-Endres/scipy,grlee77/scipy,kalvdans/scipy,jor-/scipy,aarchiba/scipy,jakevdp/scipy,lhilt/scipy,pbrod/scipy,tylerjereddy/scipy,jjhelmus/scipy,gfyoung/scipy,josephcslater/scipy,gertingold/scipy,befelix/scipy,josephcslater/scipy,nmayorov/scipy,endolith/scipy,gfyoung/scipy,aarchiba/scipy,jor-/scipy,mdhaber/scipy,rgommers/scipy,zerothi/scipy,aeklant/scipy,anntzer/scipy,gertingold/scipy,dominicelse/scipy,andyfaff/scipy,rgommers/scipy,grlee77/scipy,WarrenWeckesser/scipy,andyfaff/scipy,person142/scipy,mdhaber/scipy,pizzathief/scipy,WarrenWeckesser/scipy,endolith/scipy,befelix/scipy,aarchiba/scipy,grlee77/scipy,rgommers/scipy,scipy/scipy,gfyoung/scipy,matthew-brett/scipy,anntzer/scipy,jakevdp/scipy,mdhaber/scipy,lhilt/scipy,apbard/scipy,aarchiba/scipy,WarrenWeckesser/scipy,perimosocordiae/scipy,pizzathief/scipy,dominicelse/scipy,person142/scipy,e-q/scipy,pizzathief/scipy,Eric89GXL/scipy,andyfaff/scipy,perimosocordiae/scipy,matthew-brett/scipy,perimosocordiae/scipy,scipy/scipy,gertingold/scipy,apbard/scipy,zerothi/scipy,ilayn/scipy,jamestwebber/scipy,scipy/scipy,kalvdans/scipy,befelix/scipy,jakevdp/scipy,apbard/scipy,nmayorov/scipy,gfyoung/scipy,grlee77/scipy,pbrod/scipy,matthew-brett/scipy,jjhelmus/scipy,matthew-brett/scipy,endolith/scipy,Stefan-Endres/scipy,dominicelse/scipy,anntzer/scipy,kalvdans/scipy,WarrenWeckesser/scipy,vigna/scipy,Stefan-Endres/scipy,Eric89GXL/scipy,zerothi/scipy,befelix/scipy,jamestwebber/scipy,perimosocordiae/scipy,Eric89GXL/scipy,Eric89GXL/scipy,gertingold/scipy,nmayorov/scipy,zerothi/scipy,matthew-brett/scipy,e-q/scipy,ilayn/scipy,ilayn/scipy,kalvdans/scipy,WarrenWeckesser/scipy,josephcslater/scipy,andyfaff/scipy,person142/scipy,ilayn/scipy,person142/scipy,aeklant/scipy,aarchiba/scipy,pschella/scipy,andyfaff/scipy,jor-/scipy,pschella/scipy,tylerjereddy/scipy,jakevdp/scipy,pschella/scipy,arokem/scipy,arokem/scipy,scipy/scipy,dominicelse/scipy,mdhaber/scipy,ilayn/scipy,perimosocordiae/scipy,nmayorov/scipy,arokem/scipy,tylerjereddy/scipy,Eric89GXL/scipy,tylerjereddy/scipy